Description
Natural Anhydrite Mineral Specimen from Cumbria, United Kingdom
This Anhydrite mineral specimen from Cumbria, UK is a genuine example of a naturally occurring calcium sulfate mineral formed within evaporite deposits. The specimen displays the characteristic structure and colour typical of anhydrite, making it a notable addition to mineral collections and geological displays.
The crystal has been carefully selected for mineral quality, natural structure, and visual clarity. Its natural surfaces preserve the geological features formed during crystal growth. The listing photographs show the exact specimen you will receive, allowing collectors and buyers to closely examine the mineral’s colour, structure, and natural formation before purchase.
Please refer to the photographs for precise sizing and scale of the specimen. This crystal includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the mineral specimen is genuine.
Mineral Species and Geological Classification
Anhydrite is a calcium sulfate mineral with the chemical formula CaSO₄. It belongs to the sulfate mineral group and forms through the evaporation of sulfate-rich water in sedimentary environments.
The mineral crystallises in the orthorhombic crystal system, typically forming tabular or massive crystals. Anhydrite is closely related to gypsum (CaSO₄·2H₂O), but unlike gypsum it contains no water in its crystal structure, which is reflected in the mineral’s name derived from the Greek meaning “without water.”
When exposed to moisture over geological time, anhydrite may gradually alter into gypsum, making well-preserved anhydrite specimens particularly interesting to collectors and mineral researchers.
Colour, Crystal Habit and Physical Properties
Anhydrite commonly occurs in white, grey, pale blue, violet, or colourless varieties, depending on the trace minerals and geological conditions present during formation. Some specimens may display translucent sections or subtle colour zoning.
Typical mineral properties include:
• Mineral Species: Anhydrite
• Chemical Formula: CaSO₄
• Mineral Group: Sulfates
• Crystal System: Orthorhombic
• Colour: White, grey, colourless, pale blue, or violet
• Transparency: Transparent to translucent
• Lustre: Vitreous to pearly
• Mohs Hardness: Approximately 3–3.5
Anhydrite often exhibits distinct cleavage in three directions, forming blocky crystal fragments when broken. The mineral may also occur in massive or granular forms within sedimentary deposits.
Geological Formation in Evaporite Deposits
Anhydrite forms primarily in evaporite environments, where seawater or mineral-rich saline water evaporates in restricted basins such as lagoons or inland seas. As the water evaporates, dissolved minerals crystallise out of solution in a sequence determined by their solubility.
Calcium sulfate minerals, including gypsum and anhydrite, precipitate during this process when the concentration of sulfate and calcium ions becomes sufficiently high.
Over time, these minerals accumulate in thick sedimentary layers, often forming part of extensive evaporite rock formations. Geological pressure and changes in temperature can lead to the transformation of gypsum into anhydrite as water molecules are lost from the crystal structure.
Cumbria Geological Context
Cumbria, located in northwest England, contains a diverse geological history that includes sedimentary basins, mineral veins, and evaporite formations associated with ancient marine environments.
The region is well known among mineral collectors for its variety of mineral occurrences, including sulfates, metal ores, and secondary mineral formations associated with historic mining activity.
Anhydrite specimens from the region represent sedimentary mineral formation processes linked to ancient evaporitic conditions, providing valuable examples for collectors interested in British mineral localities.
Mineral Collecting and Display Appeal
Anhydrite specimens are valued by mineral collectors for their distinct crystal structure and their geological relationship to gypsum and other sulfate minerals. Their relatively uncommon appearance compared with more widely known minerals adds interest to collections focusing on sedimentary mineral formation.
Natural anhydrite specimens are commonly displayed in:
• Mineral collections
• Geological study collections
• Educational displays of sulfate minerals
• British mineral locality collections
Because mineral growth occurs under changing environmental conditions, each specimen develops unique colour tones, crystal shapes, and surface features.
In some cultural traditions, anhydrite has been traditionally associated with symbolic ideas related to clarity or calmness, though such interpretations are cultural perspectives rather than scientifically established properties.
Authenticity and Specimen Information
• Mineral Species: Anhydrite
• Chemical Formula: CaSO₄
• Mineral Group: Sulfates
• Crystal System: Orthorhombic
• Colour: White, grey, colourless, pale blue, or violet
• Transparency: Transparent to translucent
• Lustre: Vitreous to pearly
• Hardness: 3–3.5 Mohs
• Geological Formation: Evaporite sedimentary deposits
• Locality: Cumbria, United Kingdom
• Authenticity: Genuine mineral specimen
• Included: Certificate of Authenticity lifetime guarantee generic card
• Exact Item: The Anhydrite specimen shown in the listing photographs is the piece you will receive
This Anhydrite mineral specimen from Cumbria, UK represents a classic example of a sulfate mineral formed through evaporite processes, making it a distinctive addition to mineral collections, geological displays, and collectors specialising in British mineral localities.
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