Celestine on Fluorite W Mary Ann Cornwall Genuine Mineral Specimen with Certificate of Authenticity

Genuine Celestine on Fluorite – W Mary Ann, Menheniot, Cornwall, UK

This Celestine on Fluorite specimen from W Mary Ann, Menheniot, Cornwall, England, is a genuine and carefully selected example of classic Cornish hydrothermal mineralisation. The photograph provided shows the exact specimen you will receive. Please refer to the images for full sizing details and accurate scale.

This crystal specimen includes a Certificate of Authenticity lifetime guarantee generic card confirming its genuine origin and mineral identification.

---

Mineral & Geological Classification – Celestine

Celestine, also known as Celestite, is a strontium sulfate mineral with the chemical formula SrSO₄. It belongs to the sulfate mineral group and crystallises in the orthorhombic crystal system.

Mineral Name: Celestine (Celestite)
Chemical Formula: SrSO₄
Mineral Group: Sulfate
Crystal System: Orthorhombic
Hardness: 3–3.5 on the Mohs scale
Lustre: Vitreous to pearly
Transparency: Transparent to translucent

Celestine typically forms tabular or prismatic crystals, often displaying well-defined terminations. It is most recognised for its pale blue to sky-blue colouration, although colourless and white forms also occur depending on trace elements and growth conditions.

The delicate blue tones associated with celestine are natural and derive from minor trace impurities within the crystal structure.

---

Mineral & Geological Classification – Fluorite

Fluorite is a calcium fluoride mineral with the chemical formula CaF₂. It crystallises in the isometric (cubic) crystal system and is known for its wide range of colours.

Mineral Name: Fluorite
Chemical Formula: CaF₂
Mineral Group: Halide
Crystal System: Isometric (Cubic)
Hardness: 4 on the Mohs scale
Lustre: Vitreous
Transparency: Transparent to translucent

Fluorite commonly forms cubic crystals and may display colour zoning. Cornish fluorite often appears in purple, green, colourless or mixed tones, reflecting variations in trace element content and growth environment.

---

Geological Setting – W Mary Ann, Cornwall

W Mary Ann lies within Cornwall’s historic mining district, associated with the Cornubian granite batholith emplaced during the late Carboniferous to early Permian periods. Hydrothermal fluids circulated through fractures in surrounding rocks, depositing a complex suite of minerals within veins and open cavities.

Fluorite typically crystallised during earlier stages of hydrothermal activity, forming cubic crystals within vein systems. Celestine often developed later as sulfate-rich fluids interacted with existing mineralisation, precipitating strontium sulfate crystals on earlier-formed fluorite surfaces.

This sequential mineral growth results in attractive combinations where celestine crystals are perched upon or intergrown with fluorite matrix.

Associated minerals in similar Cornish vein systems may include quartz, calcite, galena, chalcopyrite and iron oxides, reflecting multi-stage hydrothermal processes.

---

Crystal Characteristics & Notable Traits

This specimen may display:

• Pale blue celestine crystals with sharp orthorhombic form

• Cubic fluorite crystals as contrasting matrix

• Transparent to translucent crystal faces

• Subtle colour zoning or internal inclusions

The contrast between soft blue celestine and the geometric cubic fluorite enhances visual appeal. Natural growth lines, minor surface contacts and matrix attachment are part of the specimen’s geological formation and confirm authenticity.

Celestine’s vitreous lustre combined with fluorite’s cubic symmetry creates a classic display-quality mineral association.

---

Geological Importance & Collectibility

Cornwall is internationally recognised for its complex granite-related mineralisation and historic mining heritage. Specimens from named mines such as W Mary Ann carry documented locality value and strong collector interest.

The combination of celestine on fluorite represents multi-stage hydrothermal mineral deposition within Cornish vein systems. Such associations are desirable for mineral cabinets due to both aesthetic contrast and geological significance.

This piece is suitable for mineral collectors, regional British collections and educational geological displays. As a genuine natural specimen, it exhibits unique structural characteristics shaped by its formation environment. The photograph shows the exact specimen you will receive.

---

Authenticity & Presentation

This Celestine on Fluorite specimen from W Mary Ann has been carefully chosen for crystal quality, colour contrast and locality significance. Included with your purchase is a Certificate of Authenticity lifetime guarantee generic card confirming its genuine origin from Menheniot, Cornwall, England, UK.

Combining classic Cornish hydrothermal geology with well-defined crystal association, this specimen offers mineral authenticity, regional importance and strong collector appeal in one carefully selected piece.