Blue-Grey Fluorite with Pale Green Crystal Growth | Wheal Mary Ann, Menheniot, Cornwall

A striking natural blue-grey and pale green fluorite specimen from Wheal Mary Ann, Menheniot, Cornwall, featuring contrasting crystalline formations, translucent mineral growth and warm golden-orange iron staining.

Weighing 310g, this substantial Cornish specimen displays a beautiful combination of smoky blue-grey fluorite, delicate greenish-yellow translucent crystals and intricate pale crystalline formations.

Specimen Description

This distinctive specimen showcases an attractive contrast between deep smoky blue-grey fluorite and pale green, cream and colourless crystalline growth.

One side features prominent blue-grey crystalline sections with angular surfaces and naturally fractured edges. These darker areas are partially surrounded by lighter mineral growth, creating a layered appearance.

The opposite side reveals a particularly attractive concentration of translucent pale green to yellow-green crystals, with broad reflective faces and smaller interlocking crystalline formations.

Some sections appear almost colourless, while others display soft honey and greenish tones that become more apparent under direct lighting.

Across the specimen, scattered golden-orange and rusty-brown deposits follow natural fractures and crystal boundaries. Their appearance is consistent with iron oxide or iron oxyhydroxide staining.

Several small recesses contain delicate, sparkling crystalline material, providing additional texture against the larger, more glass-like fluorite surfaces.

The specimen displays a naturally irregular formation, with multiple crystal faces, cleavage surfaces and overlapping areas of mineral growth.

Its varied structure creates an attractive display from several angles, revealing different combinations of colour, translucency and surface texture as the specimen is rotated.

At 75.1mm × 72.9mm and 310g, this is a substantial and visually interesting example of Cornish fluorite, particularly appealing to collectors of British minerals and specimens associated with historic mining localities.

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 remarkable range of natural colours, including blue, purple, green, yellow, grey, pink and colourless varieties.

Variations in fluorite colour can result from trace impurities, structural defects and the geological conditions present during crystal formation.

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

As these fluids cool or undergo changes in pressure and chemical composition, dissolved minerals can crystallise within available spaces.

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

Its characteristic cubic crystal habit and perfect octahedral cleavage are important identifying features.

Natural cleavage and fracturing can expose angular surfaces, producing the complex crystalline structures visible in many raw fluorite specimens.

The golden-orange staining present across this specimen is consistent with iron-bearing mineral alteration. Such staining can develop when iron-containing minerals oxidise, depositing iron oxides or iron oxyhydroxides along fractures and exposed surfaces.

The result is a beautiful natural contrast between cool-toned fluorite and warm mineral staining.

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 tin and copper mining, its south-eastern mineral districts also contain important lead-bearing hydrothermal veins.

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

These mineral deposits formed through hydrothermal geological processes, as heated fluids circulated through fractures in the surrounding rocks and deposited dissolved minerals.

The resulting mineral veins contain a variety of associated species, including fluorite, quartz and lead-bearing minerals.

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, rather than necessarily being the principal material extracted.

Historical geological observations describe more than one generation of fluorite mineralisation at Wheal Mary Ann.

This indicates that the mineral veins experienced successive episodes of geological activity and changing conditions of mineral deposition.

Such processes can produce complex crystal associations, overlapping mineral growth and variations in crystal colour and structure.

The contrasting blue-grey and pale green crystalline areas of this specimen make it an interesting example of the visual complexity found in natural fluorite.

Its association with Wheal Mary Ann also connects it to the rich mineralogical and industrial heritage of Cornwall.

Intention & Associated Chakras

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

Blue fluorite is traditionally linked with communication and self-expression, while green fluorite is associated with renewal, emotional harmony and personal growth.

The combination of blue-grey and pale green colouring makes this specimen symbolically associated with both the Throat Chakra and Heart Chakra.

• Mental Clarity: Traditionally associated with concentration, clear thinking and understanding.
• Communication: Symbolically connected with honest expression and thoughtful conversation.
• Emotional Balance: Associated with calm reflection and emotional harmony.
• Personal Growth: Traditionally linked with renewal, learning and positive change.
• Focus: Associated with organisation, concentration and mental discipline.
• Inner Calm: Symbolically connected with peaceful reflection and emotional steadiness.

Associated Chakras: Throat Chakra and Heart Chakra.

Primary Intention: Mental clarity, communication and emotional balance.

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

Natural Formation & Symbolism

This specimen retains its natural raw formation, displaying an irregular arrangement of interlocking crystalline sections and angular fluorite surfaces.

The smoky blue-grey areas contrast with translucent pale green and cream-coloured growth, creating a particularly attractive variation in colour and transparency.

Natural crystal boundaries, small cavities and mineral-filled recesses add further detail to the specimen.

Golden-orange iron staining follows portions of the crystalline structure, highlighting fractures and creating warm accents against the cooler mineral colours.

Within traditional crystal symbolism, blue fluorite represents clarity and communication, while green fluorite is associated with balance and renewal.

Beyond these symbolic associations, this specimen's principal appeal lies in its natural crystalline structure, contrasting colours and connection to Cornwall's historic mining landscape.

Specimen Details

• Mineral: Fluorite with iron oxide staining
• Chemical Formula: CaF₂ (Fluorite)
• Mineral Group: Halides
• Crystal System: Cubic (Isometric)
• Mohs Hardness: 4
• Supplied Locality Attribution: Wheal Mary Ann
• Location: Menheniot, Cornwall, England
• Weight: 310g
• Dimensions: 75.1mm × 72.9mm
• Formation: Natural raw fluorite with contrasting crystalline growth and iron-stained surfaces
• Colour: Blue-grey, smoky blue, pale green, cream, translucent white, golden orange and rusty brown
• Features: Angular fluorite crystal faces, translucent pale green crystalline sections, natural cleavage surfaces, small crystalline recesses and contrasting iron 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.