Blue-Grey Fluorite with Golden Iron Oxide | Wheal Mary Ann, Menheniot, Cornwall

A beautiful natural blue-grey fluorite specimen from Wheal Mary Ann, Menheniot, Cornwall, displaying contrasting areas of smoky blue crystalline fluorite, translucent cream-coloured mineral growth and striking golden-orange iron oxide staining.

Weighing 215g, this distinctive Cornish mineral specimen features angular crystal faces, naturally fractured surfaces and richly contrasting mineral colours that reflect its complex geological formation.

Specimen Description

This attractive fluorite specimen displays a particularly interesting combination of deep blue-grey, smoky blue, translucent white and pale honey-coloured crystalline sections.

One of its most distinctive features is the contrast between the darker blue-grey fluorite and the lighter, cream-coloured crystalline material surrounding it.

Across the principal display face, angular fluorite surfaces form a series of overlapping crystalline sections, with varying degrees of translucency and naturally occurring internal features.

The darker fluorite areas possess a smoky, slate-blue appearance, while the surrounding mineral growth ranges from translucent ivory to soft golden cream.

Scattered throughout the specimen are vivid deposits of golden-orange and rusty-brown mineral staining, consistent with natural iron oxide or iron oxyhydroxide alteration.

These warm mineral deposits follow crystal boundaries, natural fractures and irregular surface features, creating a striking contrast against the cooler blue-grey fluorite.

The reverse reveals a different arrangement of crystalline growth, including broader translucent surfaces, pale cream mineralisation and exposed angular crystal faces.

Several sections display a glass-like lustre, while others possess a more textured, naturally weathered appearance.

The specimen's irregular formation gives it an attractive sculptural quality, with different colours and crystalline structures becoming visible as it is viewed from multiple angles.

Measuring 62.6mm × 47.3mm and weighing 215g, this is a lovely example of naturally contrasting Cornish fluorite, particularly appealing to collectors of British minerals and historic mining specimens.

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 admired for its extraordinary variety of colours, including purple, blue, green, 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 blue-grey fluorite specimens are particularly attractive for their cool colouring and varying degrees of transparency.

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 temperature, pressure and chemistry, dissolved minerals can crystallise within the available spaces.

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

Its distinctive cubic crystal habit is one of its most recognisable features, although fluorite also possesses perfect octahedral cleavage.

These cleavage planes can create angular surfaces and complex internal structures when crystals naturally fracture.

The golden-orange staining visible across this specimen is consistent with iron oxide or iron oxyhydroxide mineralisation, which may develop through the oxidation and alteration of iron-bearing minerals.

Such staining can highlight crystal boundaries and geological fractures, creating distinctive natural colour contrasts.

Wheal Mary Ann & Cornish Mining Heritage

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

The surrounding 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 region also contains important lead-bearing mineral veins.

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

These deposits developed 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 and 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.

Historical geological observations indicate that multiple episodes of fluorite mineralisation occurred at Wheal Mary Ann.

This suggests that the mineral veins experienced changing geological conditions and successive periods of mineral deposition.

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

The combination of blue-grey fluorite, pale translucent mineral growth and contrasting iron-stained surfaces makes this specimen particularly interesting from a geological perspective.

Specimens attributed to historic Cornish mining localities are especially appealing to collectors interested in British mineralogy, geological history and Cornwall's mining heritage.

Intention & Associated Chakras

Within traditional crystal healing practices, blue fluorite is associated with mental clarity, calm communication, emotional balance and intuitive understanding.

Its blue colouring is traditionally connected with the Throat Chakra, symbolising communication, truth and self-expression.

Fluorite more generally is associated with concentration, clear thinking and emotional balance.

• Mental Clarity: Traditionally associated with clear thinking, concentration and understanding.
• Communication: Symbolically connected with honest expression and thoughtful conversation.
• Calm: Associated with peaceful reflection and emotional balance.
• Intuition: Traditionally linked with insight and personal awareness.
• Focus: Associated with organisation, learning and concentration.
• Personal Growth: Symbolically connected with understanding and positive change.

Associated Chakra: Throat Chakra.

Primary Intention: Mental clarity, communication and calm.

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 crystalline structure with numerous overlapping fluorite surfaces.

The deep blue-grey crystalline areas contrast beautifully with the pale cream and translucent white mineral growth, while golden-orange iron staining adds further depth and character.

Angular crystal faces, natural cleavage surfaces and small mineral-filled recesses provide intricate detail across the specimen.

The combination of translucent sections and more opaque crystalline areas creates variation in how light interacts with the mineral.

Within traditional crystal symbolism, blue fluorite represents clarity, communication and emotional balance.

Beyond these symbolic associations, the specimen's principal appeal lies in its natural crystalline detail, contrasting mineral colours and connection to Cornwall's historic mineral-producing 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: 215g
• Dimensions: 62.6mm × 47.3mm
• Formation: Natural fluorite specimen with iron-stained crystalline surfaces
• Colour: Blue-grey, smoky blue, translucent white, cream, golden orange and rusty brown
• Features: Angular fluorite crystal faces, natural cleavage surfaces, translucent crystalline areas, contrasting blue-grey and cream mineral growth, and iron oxide 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.