Blue-Grey Fluorite | Wheal Mary Ann, Cornwall

A beautiful natural blue-grey fluorite specimen from Wheal Mary Ann, Menheniot, Cornwall, featuring substantial angular crystal formations in smoky slate-blue, silvery-grey and subtle greenish-blue tones.

Weighing 125g, this distinctive Cornish mineral specimen displays a compact, upright formation with prominent translucent fluorite crystals, creamy-white mineral deposits and delicate rusty-orange staining. Its most striking feature is the concentration of chunky blue-grey crystals, with broad faces, angular edges and naturally fractured surfaces that reveal the mineral's internal structure.

Specimen Description

This attractive specimen features a naturally irregular, upright formation dominated by a collection of interlocking blue-grey fluorite crystals.

The principal face displays several substantial crystalline sections, ranging in colour from muted slate-blue and smoky steel-grey to softer greenish-blue and pale silvery tones.

One of the most prominent features is a broad, angular crystal face positioned towards the upper section of the specimen. Its relatively flat surface displays a soft blue-grey colour, with subtle linear markings and internal variations visible beneath the surface.

Surrounding this larger formation are numerous smaller interlocking crystals, creating a complex arrangement of geometric faces, natural cleavage planes and irregular crystalline boundaries.

The fluorite varies considerably in transparency. Some sections appear softly translucent, allowing light to penetrate the crystal edges, while others display a deeper, more opaque smoky-blue appearance.

Several crystal faces have a glass-like lustre, although areas of natural frosting and surface alteration create a more muted finish across parts of the specimen.

Scattered throughout the formation are creamy-white and pale champagne-coloured mineral deposits, particularly visible between the larger blue-grey crystals and around the lower section.

These lighter areas contrast beautifully with the cooler fluorite, emphasising the specimen's natural geometric structure.

Small patches of rusty-orange and reddish-brown mineral staining are also visible around several crystal boundaries and fractures, adding further colour variation and geological character.

The reverse displays an extensive concentration of blue-grey fluorite, with multiple angular crystalline surfaces overlapping to form an uneven, naturally textured face.

From this angle, the deeper blue-grey tones become particularly noticeable, with several darker patches visible beneath the translucent crystal surfaces.

The upper edge features a series of larger, blocky formations with partially exposed faces and naturally irregular terminations.

Viewed from above, the specimen reveals an attractive arrangement of substantial geometric crystal faces, with a particularly prominent central blue-grey formation surrounded by smaller crystalline sections.

The top-down view highlights the contrast between the larger, relatively smooth faces and the smaller fractured surfaces that surround them.

Under closer examination, individual crystals reveal internal fractures, subtle colour zoning, fine surface markings and small areas of pale mineral coating.

These naturally occurring features give the specimen considerable depth and visual interest, particularly when viewed under changing lighting conditions.

Measuring 54.5mm × 39.4mm and weighing 125g, this compact but visually striking specimen would make an attractive addition to a British mineral collection or a display of historic Cornish fluorite.

About Fluorite

Fluorite (CaF₂) is a naturally occurring calcium fluoride mineral belonging to the halide mineral group.

It crystallises in the cubic, or isometric, crystal system and has a Mohs hardness of 4.

Fluorite is particularly admired for its extraordinary range of colours, which include purple, blue, green, yellow, pink, brown and colourless varieties.

These colour variations can result from trace impurities, structural defects and other geological processes occurring during crystal formation.

Blue and blue-grey fluorite specimens can display particularly attractive colour variations, ranging from pale silvery-blue and greenish-grey to deeper slate-blue and smoky steel-grey.

Fluorite commonly forms in hydrothermal mineral veins, where heated mineral-rich fluids circulate through fractures and cavities in surrounding rocks.

As the chemical and physical conditions change, dissolved minerals may crystallise within these openings, sometimes producing several generations of mineral growth.

Fluorite frequently occurs alongside quartz, calcite, baryte, galena, siderite and other minerals associated with hydrothermal ore deposits.

One of fluorite's most distinctive physical properties is its perfect octahedral cleavage.

This means that the mineral can separate along specific crystallographic planes, producing characteristic angular surfaces.

Fluorite typically displays a vitreous, or glass-like, lustre, although natural weathering and surface alteration can produce frosted or matte areas.

Internal fractures, colour variations, inclusions and mineral coatings are common features of natural fluorite specimens.

Some fluorite specimens also exhibit fluorescence under ultraviolet light, although this property varies between localities and individual specimens.

Ultraviolet fluorescence has not been confirmed for this particular piece.

Wheal Mary Ann & Cornish Mining Heritage

Wheal Mary Ann is a historic mineral locality situated near Menheniot in south-east Cornwall, England.

The Menheniot district forms part of Cornwall's extensive mining landscape and is particularly associated with historic lead and silver mining.

Although Cornwall is internationally recognised for its tin and copper deposits, the south-eastern part of the county also contains important lead-bearing mineral veins.

During the nineteenth century, mining operations around Menheniot extracted lead ores, particularly galena, which could also contain economically valuable silver.

The mineral veins of the district formed through hydrothermal geological processes, with mineral-rich fluids circulating through fractures in the surrounding rocks.

These fluids deposited a varied assemblage of minerals, including quartz, fluorite, galena, siderite, calcite and other associated species.

Wheal Mary Ann is of particular geological interest because historical geological studies document complex relationships between successive generations of mineral deposition.

The British Geological Survey's geological memoir covering Plymouth and South-East Cornwall records fluorite as an important gangue mineral at Wheal Mary Ann.

Gangue minerals are those occurring alongside economically valuable ores but are not necessarily the principal materials being mined.

The memoir describes quartz as a significant vein-filling mineral, with chalcedonic material occurring along parts of the vein walls.

Crystalline quartz, galena and siderite are also documented within the mineral sequence.

Historical geological observations indicate that at least two generations of fluorite mineralisation occurred at Wheal Mary Ann.

This suggests that the mineral veins experienced multiple episodes of deposition under changing geological conditions.

Such processes can produce overlapping crystalline formations, variations in colour and complex mineral associations.

Fluorite from historic Cornish localities is particularly appealing to collectors interested in British mineralogy, geological history and the country's mining heritage.

This specimen offers an attractive example of natural fluorite attributed to the Wheal Mary Ann locality, with its distinctive blue-grey colouring and substantial angular crystal faces providing considerable mineralogical interest.

Intention & Associated Chakras

Within traditional crystal healing practices, fluorite is associated with mental clarity, concentration, emotional balance and organised thinking.

Blue fluorite is commonly associated with the Throat Chakra, symbolically representing communication, self-expression and clear understanding.

Fluorite is also traditionally connected with the Third Eye Chakra, associated with intuition, awareness and mental clarity.

The softer greenish-blue sections of this specimen may additionally be associated with the Heart Chakra, which symbolically represents emotional balance and harmony.

• Mental Clarity: Traditionally associated with clear thinking, understanding and mental organisation.
• Focus: Symbolically connected with concentration, learning and maintaining attention.
• Calm: Associated with emotional balance, peaceful reflection and a settled mindset.
• Communication: Blue fluorite is traditionally linked with thoughtful communication and self-expression.
• Intuition: Associated with awareness, perspective and personal insight.
• Spiritual Growth: Symbolically connected with reflection, understanding and self-awareness.

Associated Chakras: Throat Chakra, Third Eye Chakra and Heart Chakra.

Primary Intention: Calm and mental clarity.

These associations reflect traditional spiritual beliefs and are not scientifically established effects of fluorite.

Natural Formation & Symbolism

This specimen retains its natural crystalline structure, angular edges, exposed cleavage surfaces and areas of pale mineral coating.

The prominent blue-grey crystals create a particularly striking appearance, with their geometric faces contrasting against the softer, irregular formations surrounding them.

Its mixture of translucent and opaque sections produces subtle variations in colour and depth, especially when viewed from different angles.

The creamy-white deposits and small areas of rusty-orange staining add further geological character, highlighting natural fractures and boundaries between the crystals.

Within traditional crystal symbolism, blue fluorite is associated with calm communication, mental clarity and thoughtful understanding.

The softer greenish-blue tones are sometimes connected with emotional harmony and balanced awareness.

Beyond its symbolic associations, this specimen is particularly appealing for its substantial crystal faces, distinctive colouration and connection to Cornwall's historic mineral-producing landscape.

Specimen Details

• Mineral: Fluorite
• Chemical Formula: CaF₂
• Mineral Group: Halides
• Crystal System: Cubic (Isometric)
• Mohs Hardness: 4
• Supplied Locality Attribution: Wheal Mary Ann
• Location: Menheniot, Cornwall, England
• Weight: 125g
• Dimensions: 54.5mm × 39.4mm
• Formation: Natural fluorite specimen
• Colour: Blue-grey, slate-blue, smoky steel-grey, pale greenish-blue, creamy-white and champagne
• Features: Prominent angular blue-grey crystals, translucent sections, natural cleavage surfaces, internal fractures, pale mineral coatings and minor rusty-orange staining
• Shape: Raw
• Finish: Natural, unpolished
• Quantity: One individual specimen

You will receive the exact specimen photographed. Natural mineral specimens may display irregular edges, fractures, inclusions, uneven surfaces, mineral staining and delicate crystalline formations.

The acrylic display support, wooden plinth and decorative flowers shown in the photographs are not included.

Sources & References

1. British Geological Survey – Plymouth and South-East Cornwall Area, Geological Memoir (Sheet 348). Geological documentation describing the Menheniot mineral veins, Wheal Mary Ann mineralisation and multiple generations of fluorite formation.
   British Geological Survey Geological Memoir
2. British Geological Survey – Silver, Mineral Resources Consultative Committee Mineral Dossier. Geological and historical information concerning the Menheniot lead-silver mining district.
   British Geological Survey Silver Mineral Dossier
3. Mindat – Wheal Mary Ann, Menheniot, Cornwall. Mineral locality database documenting fluorite and associated mineral species.
   Wheal Mary Ann Mineral Locality
4. University of Cambridge – Fluorite Mineral Collection. Mineralogical information concerning fluorite's chemical composition, crystal system, cleavage and physical properties.
   University of Cambridge Fluorite Collection
5. Henwood, W. J. (1871). Observations on Metalliferous Deposits: On the Lead Mines of Menheniot, Lanreath and Saint Pinnock. Transactions of the Royal Geological Society of Cornwall, Volume 8, pages 699–722.