Hematoid Quartz | Rostowrack China Clay Pit, Cornwall | No. 2

A beautiful 280g Cornish hematoid quartz specimen featuring intergrown translucent quartz crystals, warm peach and champagne tones, and delicate iron-rich mineral staining, originating from Rostowrack China Clay Pit at Hendra Downs, near St Dennis, Cornwall.

This substantial natural mineral specimen combines attractive crystalline textures, subtle colour variations and the geological heritage of Cornwall's historic china clay district.

Specimen Description

This striking hematoid quartz specimen displays a compact, irregular formation composed of numerous intergrown quartz crystals, creating a richly textured surface with beautiful variations in transparency and colour.

The specimen's predominant colours range from milky white and pale champagne to warm peach, soft apricot and delicate reddish-pink tones.

Its most distinctive feature is the abundance of individual quartz crystals distributed across the exposed surfaces. These crystals vary in size and shape, with numerous visible faces reflecting light from different angles.

Several larger translucent crystals stand out against the surrounding finer crystalline material, creating an attractive contrast between the more transparent formations and the densely intergrown milky quartz.

Warm orange and reddish staining occurs throughout the specimen, particularly around crystal boundaries, natural fractures and recessed areas.

This colouration is consistent with the presence of iron-bearing mineral material, commonly associated with hematoid quartz.

Some surfaces display a softly frosted appearance, while others exhibit a brighter vitreous lustre, producing subtle flashes of light as the specimen is rotated.

One side reveals a more compact crystalline structure with pale cream-coloured material and warm iron-stained areas. Other faces display larger, more clearly defined quartz crystals arranged in overlapping and intergrown formations.

Natural recesses between the crystals add depth to the specimen, while its irregular outline preserves the character of the original geological formation.

The combination of peach-toned staining, translucent crystal faces and substantial crystalline growth makes this an attractive display specimen for collectors of Cornish minerals, British quartz and iron-stained crystalline formations.

Weighing 280g and measuring approximately 54.0mm × 75.3mm, this specimen offers an excellent opportunity to appreciate the varied crystal growth and mineralisation associated with Cornwall's St Austell granite district.

About the Mineral

Quartz (SiO₂) is a silicon dioxide mineral belonging to the trigonal crystal system, with a Mohs hardness of 7.

Quartz is one of the most widespread minerals in the Earth's continental crust and occurs in a wide variety of geological environments, including granitic rocks, hydrothermal veins and mineralised fractures.

It commonly forms when silica-bearing fluids circulate through fractures and cavities, depositing crystalline silica as geological conditions change.

Hematoid Quartz is a descriptive trade term generally used for quartz displaying reddish, pink, orange or brown colouration associated with iron-bearing mineral inclusions or staining.

The name is particularly associated with hematite, although similar colouration may also result from other iron oxides and oxyhydroxides.

Hematite (Fe₂O₃) is an iron oxide mineral commonly recognised by its reddish-brown streak. It can occur as massive material, earthy coatings, crystalline aggregates and microscopic inclusions within other minerals.

Iron-bearing minerals may become incorporated into quartz during crystal growth or deposited along fractures and crystal surfaces during later geological alteration.

These processes can produce the warm reddish and orange colouration commonly associated with hematoid quartz specimens.

In this specimen, the quartz displays warm peach and reddish mineral staining distributed throughout its crystalline structure.

Although these features are consistent with iron-bearing mineralisation, the exact mineral responsible for the colouration has not been independently laboratory identified.

The specimen also displays areas of milky quartz, characterised by a cloudy-white appearance commonly caused by microscopic fluid inclusions that scatter light within the crystal structure.

The association of translucent quartz, milky crystalline material and iron-rich staining creates a particularly attractive example of natural quartz mineralisation.

Rostowrack China Clay Pit & Cornish Heritage

Rostowrack China Clay Pit is situated at Hendra Downs, near St Dennis, within Cornwall's historically important St Austell granite district.

The St Austell granite is internationally recognised for its extensive kaolin deposits, commonly known as china clay.

These deposits developed through the alteration of feldspar-bearing granite, producing clay-rich material that became one of Cornwall's most significant industrial mineral resources.

China clay extraction played a major role in the industrial development of the St Austell area, supplying materials for porcelain, ceramics, paper manufacture and numerous other industries.

Unlike Cornwall's more widely recognised tin and copper mines, the china clay industry concentrated primarily on the extraction and processing of altered granite.

However, the geological processes affecting the St Austell granite also produced quartz veins, mineralised fractures and a diverse range of associated minerals.

Rostowrack is particularly significant because its granite exposures and mineralised structures have been described in published geological field studies.

A geological field excursion account by C. M. Bristow and J. H. Howe, published in 1995, discusses Rostowrack China Stone Quarry and China Clay Pit in the context of the western St Austell granite.

The study documents granite alteration and quartz vein mineralisation associated with the geological development of the locality.

Further geological documentation prepared for EUROGRANITES 2014 describes Rostowrack as an exposure of topaz-bearing granite affected by structurally controlled kaolinisation.

The field guide also records a prominent multistage quartz-hematite vein within the Rostowrack workings.

This documented association of quartz and hematite provides relevant geological context for iron-stained quartz specimens attributed to the locality.

Mineralogical records also document quartz, hematite, fluorite, kaolinite and other minerals from Rostowrack.

These occurrences reflect the complex geological history of granite crystallisation, hydrothermal alteration and subsequent mineralisation within the St Austell district.

Rostowrack also has historical connections with Cornwall's china stone industry.

China stone is a feldspar-bearing granitic material historically used in ceramic manufacture, particularly alongside china clay.

The Wheal Martyn Trust preserves and interprets the history of Cornwall's china clay industry, helping document the importance of these materials to the county's industrial heritage.

Mineral specimens attributed to Rostowrack therefore offer a fascinating connection between Cornwall's natural geological processes and its long history of industrial mineral extraction.

Intention & Associated Chakras

In traditional crystal healing practices, hematoid quartz is associated with a combination of grounding and clarity, reflecting the symbolic qualities commonly attributed to quartz and iron-bearing minerals.

• Grounding: Traditionally associated with stability, balance and a stronger sense of connection to the present moment.
• Clarity: Symbolically linked with clear thinking, concentration and renewed perspective.
• Protection: Associated with personal boundaries, resilience and inner strength.
• Growth & Success: Traditionally connected with motivation, determination and working towards personal goals.
• Spiritual Growth: Associated with reflection, self-awareness and personal development.

Associated Chakras: Root Chakra and Solar Plexus Chakra.

Intention: Protection and Growth & Success.

These associations belong to crystal healing traditions and are not scientifically established properties of quartz or iron-bearing minerals.

Natural Formation & Symbolism

As a naturally formed raw mineral specimen, this piece retains its irregular outline, exposed crystalline surfaces, natural fractures and distinctive iron-rich colouration.

The intergrown quartz crystals demonstrate the complex processes through which mineral-bearing fluids can deposit successive generations of crystalline material within geological openings.

Its warm peach and reddish tones contrast beautifully with the softer milky-white quartz, creating a visually interesting combination of colour, texture and transparency.

Raw quartz formations are traditionally associated with authenticity, clarity and connection to the natural world.

The combination of translucent quartz and earthy iron-rich staining may also be interpreted symbolically as representing a balance between clear intention and grounded determination.

Beyond these traditional associations, this specimen provides an appealing example of the natural mineralogical diversity associated with Cornwall's granite landscapes.

Specimen Details

• Mineral: Hematoid Quartz
• Primary Mineral: Quartz (SiO₂)
• Associated Colouration: Iron-bearing mineral staining
• Crystal System: Trigonal
• Mohs Hardness: 7 (quartz)
• Mine: Rostowrack China Clay Pit
• Locality: Hendra Downs, St Dennis, Cornwall, England
• Weight: 280g
• Measurements: 54.0mm × 75.3mm
• Formation: Natural raw specimen with intergrown quartz crystals
• Colour: Milky white, champagne, peach, apricot and reddish pink
• Associated Features: Iron-rich mineral staining, translucent crystal faces and natural crystalline recesses
• Finish: Natural, unpolished
• Condition: Natural crystalline surfaces, irregular edges, mineral staining and geological textures
• Quantity: One individual specimen

You will receive the exact specimen photographed. Natural mineral specimens may contain fractures, uneven surfaces, delicate crystal points, inclusions and variations resulting from their geological formation.

Wooden display plinth and decorative flowers shown in the photographs are not included.

Sources & References

The following resources provide geological, mineralogical and historical information relating to Rostowrack China Clay Pit and the surrounding St Austell granite district:

1. Mindat – Rostowrack China Clay Pit, Cornwall. Mineral locality database providing records of the locality and its mineral occurrences.
2. Bristow & Howe (1995) – Field Excursion to the Fal Valley, Western St Austell Granite. Geological field account discussing Rostowrack, altered granite and quartz vein mineralisation.
3. EUROGRANITES 2014 – Granites and Mineralisation of South West England. Geological field guide describing Rostowrack's kaolinised granite, quartz-hematite vein and associated mineralisation.
4. Wheal Martyn Trust – China Stone. Museum resource concerning Cornwall's china stone heritage and its relationship with the china clay industry.

Historical and geological references relate to the recorded Rostowrack locality. The provenance of this individual specimen is based on supplied collection information. Although quartz and hematite mineralisation are documented at Rostowrack, the exact composition of the iron-bearing colouration within this individual specimen has not been independently laboratory verified.