{"product_id":"smoky-quartz-crystal-cluster-rostowrack-china-clay-pit-cornwall-no-3","title":"Smoky Quartz Crystal Cluster | Rostowrack China Clay Pit, Cornwall |  No. 3","description":"\u003cp\u003eA beautiful natural Cornish smoky quartz specimen featuring an impressive concentration of translucent smoky-grey crystals nestled within a contrasting milky-white quartz matrix. Attributed to Rostowrack China Clay Pit, Hendra Downs, near St Dennis, Cornwall, this 395g specimen displays intricate crystal growth, well-defined terminations and a striking natural formation.\u003c\/p\u003e\n\u003cp\u003eWith its distinctive upright profile, densely packed crystal-lined recess and contrasting smoky and milky quartz, this is an attractive addition to any collection of Cornish minerals, British quartz or historic mining specimens.\u003c\/p\u003e\n\u003ch3\u003eSpecimen Description\u003c\/h3\u003e\n\u003cp\u003eThis striking specimen features a naturally irregular, approximately triangular formation of milky-white quartz surrounding an extensive central area of smoky quartz crystallisation.\u003c\/p\u003e\n\u003cp\u003eThe main crystal-lined recess extends vertically across the front of the specimen, revealing numerous intergrown smoky-grey crystals of varying sizes.\u003c\/p\u003e\n\u003cp\u003eThe crystals display beautiful translucent grey, soft taupe and brownish-grey tones, with deeper smoky colouration visible towards the centre of the formation.\u003c\/p\u003e\n\u003cp\u003eSeveral prominent quartz crystals exhibit well-developed natural faces and pointed terminations, while smaller crystals form densely intergrown clusters around them.\u003c\/p\u003e\n\u003cp\u003eThe close-up photographs reveal intricate crystal geometry, reflective surfaces and subtle variations in transparency across the formation.\u003c\/p\u003e\n\u003cp\u003eIndividual crystal faces catch and reflect light, creating an attractive glassy lustre and highlighting the complexity of the natural growth.\u003c\/p\u003e\n\u003cp\u003eThe smoky quartz is surrounded by substantial areas of opaque milky-white quartz, creating a strong visual contrast between the darker translucent crystals and the pale surrounding material.\u003c\/p\u003e\n\u003cp\u003eThe outer quartz has an uneven, granular appearance, with natural ridges, smaller crystalline growths and irregular mineral surfaces.\u003c\/p\u003e\n\u003cp\u003eFrom the side, the specimen reveals a substantial pale quartz matrix with smaller smoky quartz crystals extending into the natural openings.\u003c\/p\u003e\n\u003cp\u003eViewed from above, the concentration of smoky quartz becomes particularly apparent, with numerous individual crystals packed closely together within the central recess.\u003c\/p\u003e\n\u003cp\u003eThe upper portion features smaller pale crystals transitioning into the deeper smoky-grey cluster below.\u003c\/p\u003e\n\u003cp\u003eSubtle cream and beige colour variations occur across the matrix, while some crystal surfaces display natural internal cloudiness and inclusions.\u003c\/p\u003e\n\u003cp\u003eThe overall formation provides considerable visual depth, with the darker crystals appearing recessed within the surrounding white quartz.\u003c\/p\u003e\n\u003cp\u003eWeighing 395g and measuring 107.1mm along its longest supplied dimension, this is a substantial raw mineral specimen suitable for display or inclusion in a specialist Cornish mineral collection.\u003c\/p\u003e\n\u003ch3\u003eAbout Smoky Quartz\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSmoky Quartz (SiO₂)\u003c\/strong\u003e is a naturally occurring colour variety of quartz, a mineral belonging to the trigonal crystal system with a Mohs hardness of 7.\u003c\/p\u003e\n\u003cp\u003eQuartz is a common rock-forming mineral found in granitic rocks, hydrothermal veins, metamorphic environments and many other geological settings.\u003c\/p\u003e\n\u003cp\u003eSmoky quartz is distinguished by its characteristic grey to brown colouration, which can range from pale translucent grey to almost opaque black.\u003c\/p\u003e\n\u003cp\u003eThe smoky colour is generally produced when natural ionising radiation interacts with aluminium-related defects in the quartz crystal structure, creating colour centres.\u003c\/p\u003e\n\u003cp\u003eThe intensity of colour varies depending on the mineral's geological history and the development of these colour centres.\u003c\/p\u003e\n\u003cp\u003eQuartz crystals commonly form from silica-bearing fluids circulating through fractures, veins and cavities within rocks.\u003c\/p\u003e\n\u003cp\u003eWhere sufficient space is available, crystals may develop characteristic prismatic faces and pointed terminations.\u003c\/p\u003e\n\u003cp\u003eWhere growing crystals compete for space, densely intergrown clusters can develop, producing intricate arrangements of individual crystal faces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMilky Quartz\u003c\/strong\u003e is an opaque or cloudy-white variety of quartz, with its appearance commonly caused by numerous microscopic fluid inclusions that scatter light.\u003c\/p\u003e\n\u003cp\u003eThis specimen combines the translucent smoky-grey variety with substantial milky-white quartz, demonstrating the contrasting appearances quartz can develop within natural mineral formations.\u003c\/p\u003e\n\u003cp\u003eThe precise growth sequence and conditions responsible for this individual specimen have not been independently established.\u003c\/p\u003e\n\u003ch3\u003eRostowrack China Clay Pit \u0026amp; Cornish Geological Heritage\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eRostowrack China Clay Pit\u003c\/strong\u003e is a documented geological locality at Hendra Downs, near St Dennis, within Cornwall's St Austell granite district.\u003c\/p\u003e\n\u003cp\u003eThe St Austell granite is particularly significant for its extensive kaolin deposits, commonly known as china clay.\u003c\/p\u003e\n\u003cp\u003eThese deposits formed through the alteration of feldspar-bearing granite, producing clay-rich material that became an important industrial mineral resource.\u003c\/p\u003e\n\u003cp\u003eChina clay extraction played a major role in Cornwall's industrial development, particularly during the nineteenth and twentieth centuries.\u003c\/p\u003e\n\u003cp\u003eThe St Austell district became one of the world's best-known china clay producing regions, supplying material for ceramics, porcelain, paper manufacture and other industrial applications.\u003c\/p\u003e\n\u003cp\u003eAlongside its china clay deposits, the district contains a variety of quartz-bearing veins and associated mineralisation reflecting the complex geological evolution of the granite.\u003c\/p\u003e\n\u003cp\u003eGeological field studies of Rostowrack document altered granite, structurally controlled kaolinisation and quartz-bearing mineral veins.\u003c\/p\u003e\n\u003cp\u003eA field excursion account by C. M. Bristow and J. H. Howe (1995) discusses Rostowrack China Stone Quarry and China Clay Pit within the western St Austell granite.\u003c\/p\u003e\n\u003cp\u003eGeological documentation associated with EUROGRANITES 2014 also describes Rostowrack's altered granite and a prominent multistage quartz-hematite vein.\u003c\/p\u003e\n\u003cp\u003eThese records establish quartz mineralisation as an important feature of the locality's geological history.\u003c\/p\u003e\n\u003cp\u003eThe wider St Austell granite district has experienced granite emplacement, hydrothermal alteration, fracturing and mineral deposition over geological time.\u003c\/p\u003e\n\u003cp\u003eSuch processes can create mineral veins and cavities in which quartz crystals may develop.\u003c\/p\u003e\n\u003cp\u003eFor mineral collectors, specimens attributed to Rostowrack offer a connection to Cornwall's geological diversity and the history of its china clay industry.\u003c\/p\u003e\n\u003ch3\u003eIntention \u0026amp; Associated Chakras\u003c\/h3\u003e\n\u003cp\u003eWithin traditional crystal healing practices, smoky quartz is associated with grounding, protection, emotional balance and personal resilience.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Traditionally associated with a sense of security, energetic boundaries and stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Symbolically connected with maintaining balance and feeling connected to the physical world.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalm:\u003c\/strong\u003e Associated with relaxation, emotional steadiness and peaceful reflection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrowth \u0026amp; Success:\u003c\/strong\u003e Traditionally linked with perseverance, determination and practical decision-making.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Symbolically associated with concentration, clear thinking and releasing distractions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiritual Growth:\u003c\/strong\u003e Associated with reflection, self-awareness and personal development.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAssociated Chakras:\u003c\/strong\u003e Root Chakra and Solar Plexus Chakra.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Intention:\u003c\/strong\u003e Growth \u0026amp; Success.\u003c\/p\u003e\n\u003cp\u003eThese associations reflect traditional spiritual beliefs and are not scientifically established effects of quartz.\u003c\/p\u003e\n\u003ch3\u003eNatural Formation \u0026amp; Symbolism\u003c\/h3\u003e\n\u003cp\u003eThis raw specimen retains its natural crystal-lined recess, irregular outer matrix, exposed quartz faces and contrasting mineral textures.\u003c\/p\u003e\n\u003cp\u003eThe central smoky quartz cluster creates a striking focal point, framed by pale milky quartz that emphasises the depth and colour of the darker crystals.\u003c\/p\u003e\n\u003cp\u003eIts naturally developed crystal faces, subtle inclusions and uneven surfaces reflect the complex processes involved in mineral formation.\u003c\/p\u003e\n\u003cp\u003eIn crystal symbolism, smoky quartz is often associated with stability, grounding and resilience, while milky quartz is traditionally linked with clarity and peaceful reflection.\u003c\/p\u003e\n\u003cp\u003eBeyond these symbolic associations, this specimen provides an attractive example of natural quartz crystallisation and the geological character of Cornwall's granite districts.\u003c\/p\u003e\n\u003ch3\u003eSpecimen Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMineral:\u003c\/strong\u003e Smoky Quartz with Milky Quartz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical Formula:\u003c\/strong\u003e SiO₂\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal System:\u003c\/strong\u003e Trigonal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMohs Hardness:\u003c\/strong\u003e 7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplied Locality Attribution:\u003c\/strong\u003e Rostowrack China Clay Pit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocation:\u003c\/strong\u003e Hendra Downs, St Dennis, Cornwall, England\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 395g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 81.5mm × 107.1mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormation:\u003c\/strong\u003e Natural raw quartz specimen with intergrown smoky quartz crystals and a crystal-lined recess\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Smoky grey, grey-brown, taupe, milky white and pale cream\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e Well-defined crystal faces, pointed terminations, intergrown clusters, translucent smoky quartz and contrasting white quartz matrix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Raw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Natural, unpolished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e One individual specimen\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eYou will receive the exact specimen photographed. Natural mineral specimens may display irregular edges, fractures, inclusions, uneven surfaces and delicate exposed crystal formations.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eWooden display plinth and decorative flowers shown in the photographs are not included.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eSources \u0026amp; References\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.mindat.org\/loc-1198.html\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eMindat – Rostowrack China Clay Pit, Cornwall\u003c\/a\u003e. Mineral locality reference for the recorded Rostowrack workings and associated mineral occurrences.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/ussher.org.uk\/wp-content\/uploads\/journal\/1995\/24-Bristow_Howe_1995.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eBristow \u0026amp; Howe (1995) – Field Excursion to the Fal Valley, Western St Austell Granite\u003c\/a\u003e. Geological field excursion documentation discussing Rostowrack and the geology of the western St Austell granite.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.csm-museum.co.uk\/downloads\/eurogr2014.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eEUROGRANITES 2014 – Granites and Mineralisation of South West England\u003c\/a\u003e. Geological field guide documenting Rostowrack's altered granite, kaolinisation and quartz-hematite mineralisation.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.wheal-martyn.com\/china-stone\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eWheal Martyn Trust – China Stone\u003c\/a\u003e. Heritage resource concerning Cornwall's china stone and china clay industries.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003csmall\u003eReferences concern the recorded geological locality and its wider geological history.\u003c\/small\u003e\u003c\/p\u003e","brand":"Harpo's Angels","offers":[{"title":"Default Title","offer_id":59263246565711,"sku":null,"price":69.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1028\/1238\/5615\/files\/download_fccc7457-f85d-4dcb-b282-88690021e965.png?v=1792955768","url":"https:\/\/harposangels.co.uk\/products\/smoky-quartz-crystal-cluster-rostowrack-china-clay-pit-cornwall-no-3","provider":"Harpo's Angels","version":"1.0","type":"link"}