Smoky Grey & Blue Fluorite | Wheal Mary Ann, Menheniot, Cornwall

A striking natural smoky grey and blue fluorite specimen from Wheal Mary Ann, Menheniot, Cornwall, displaying beautiful slate-blue crystalline sections, translucent smoky-grey fluorite and contrasting pale honey-coloured mineral growth.

Weighing 90g, this distinctive Cornish mineral specimen features intricate angular crystal formations, naturally fractured surfaces, delicate rusty-orange staining and small flashes of rainbow iridescence visible within its crystalline structure.

Specimen Description

This beautiful fluorite specimen showcases an unusual combination of smoky grey, slate blue, pale blue-grey, honey yellow and creamy-white colouring.

The most prominent feature is the substantial smoky-grey and blue-grey crystalline area extending across the specimen.

These darker sections display varying degrees of translucency, with overlapping crystal faces creating subtle changes in colour and depth.

Some areas appear almost charcoal-grey, while others reveal softer slate-blue tones when viewed under different lighting conditions.

Across the specimen, naturally fractured crystal faces form an intricate arrangement of angular surfaces, stepped formations and reflective cleavage planes.

The close-up photographs reveal particularly attractive internal structures, including delicate translucent layers and small areas of rainbow iridescence along internal fractures.

These colourful flashes are consistent with light interacting with fine fractures within the mineral, creating subtle optical effects.

The darker fluorite contrasts with paler crystalline sections around the edges and underside of the specimen.

These lighter areas range from creamy white to translucent champagne and soft honey-yellow, adding warmth to the predominantly cool-toned mineral.

Small patches of rusty-orange and golden-brown staining are visible along some fractures and crystal boundaries.

Such colouring is consistent with natural iron-bearing mineral staining, although the exact composition has not been independently tested.

The specimen has an irregular, slightly triangular natural formation, with a broad crystalline face tapering towards one end.

Its combination of darker translucent fluorite, lighter mineral growth and complex crystal textures creates an attractive contrast from every angle.

Measuring 41.6mm × 53.3mm and weighing 90g, this specimen is an appealing example of fluorite attributed to the historic Wheal Mary Ann mineral locality in Cornwall.

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 variety of natural colours, which include purple, green, blue, yellow, pink, grey and colourless varieties.

Its colouration can be influenced by trace impurities, structural defects and the geological conditions present during crystal formation.

Blue and grey fluorite may display delicate smoky, slate-coloured or translucent tones, sometimes appearing different depending on the angle and intensity of the light.

Fluorite commonly forms 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 chemistry, dissolved minerals can crystallise within the available spaces.

Fluorite is frequently associated with quartz, calcite, baryte, galena, siderite and other minerals found within hydrothermal deposits.

One of its defining physical characteristics is its perfect octahedral cleavage.

This means fluorite can separate along particular crystallographic planes, creating distinctive angular surfaces and geometric formations.

These cleavage surfaces are especially noticeable in natural specimens displaying overlapping crystalline sections and internal fractures.

Fluorite also exhibits a vitreous, or glass-like, lustre, although naturally weathered and fractured surfaces may appear frosted or textured.

Some fluorite specimens display fluorescence under ultraviolet light, but this characteristic varies considerably between specimens and localities.

UV fluorescence has not been confirmed for this individual specimen.

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.

While Cornwall is internationally recognised for its tin and copper deposits, the south-eastern region also contains significant lead-bearing mineral veins.

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

These deposits formed through hydrothermal geological processes, as heated mineral-rich fluids circulated through fractures within the surrounding rocks.

Over time, these fluids deposited a varied assemblage of minerals, including quartz, fluorite, galena, siderite and other associated species.

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

Gangue minerals occur alongside economically valuable ores but are not necessarily the principal materials being extracted.

The memoir describes quartz as a significant vein-filling mineral, with crystalline quartz, galena and siderite 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 mineral deposition under changing geological conditions.

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

Fluorite from historic Cornish mining 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 fluorite attributed to Wheal Mary Ann, combining smoky-grey and blue-grey crystalline sections with contrasting pale mineral growth and intricate natural textures.

Intention & Associated Chakras

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

Blue fluorite is traditionally linked with the Throat Chakra, symbolising communication, self-expression and clear understanding.

Grey fluorite is sometimes associated with grounding, stability and balanced thinking.

Fluorite is also commonly connected with the Third Eye Chakra, representing intuition, insight and mental clarity.

• Mental Clarity: Traditionally associated with clear thinking and understanding.
• Communication: Symbolically connected with self-expression and honest communication.
• Focus: Associated with concentration and mental organisation.
• Grounding: Traditionally linked with stability and emotional balance.
• Calm: Symbolically connected with peaceful reflection and a balanced outlook.
• Personal Growth: Associated with learning, understanding and positive change.

Associated Chakras: Throat Chakra and Third Eye Chakra.

Primary Intention: Mental clarity, communication and grounding.

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

Natural Formation & Symbolism

This specimen retains its natural crystalline formation, displaying an irregular shape with overlapping fluorite sections and contrasting colour zones.

The smoky-grey and slate-blue areas create a striking visual contrast against the warmer honey-yellow and creamy-white mineral growth.

Angular crystal boundaries and natural cleavage planes reveal the mineral's distinctive internal structure.

Small areas of rusty-orange staining add further visual interest, emphasising the specimen's natural geological character.

The close-up photographs reveal delicate internal fractures and small flashes of rainbow iridescence within the crystalline material.

Some surfaces exhibit a smooth, glass-like lustre, while others display a more textured or naturally frosted appearance.

Within traditional crystal symbolism, blue fluorite is associated with communication and understanding, while grey fluorite represents grounding and stability.

Beyond these symbolic associations, the specimen's principal appeal lies in its contrasting natural colours, intricate crystalline structure 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: 90g
• Dimensions: 41.6mm × 53.3mm
• Formation: Natural fluorite specimen with associated crystalline material
• Colour: Smoky grey, slate blue, pale blue-grey, creamy white and honey yellow
• Features: Translucent fluorite, angular crystal formations, internal fractures, rainbow iridescence, natural mineral staining and reflective cleavage surfaces
• Shape: Raw
• Finish: Natural, unpolished
• UV Reactive: Not confirmed
• 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.