British Selenite Crystal Tidmore Point Dorset UK Gypsum Mineral Natural Collector Specimen Coastal Geological Find Genuine with Certificate

British Selenite Crystal from Tidmore Point, Dorset, UK

This genuine British Selenite crystal specimen originates from Tidmore Point in Dorset, United Kingdom, a coastal locality known among collectors for producing natural gypsum crystals within the Jurassic sedimentary deposits of southern England. Carefully selected for its natural form and mineral character, this specimen represents a distinctive example of British evaporite mineral formation.

The crystal shown in the listing photographs is the exact specimen you will receive, allowing collectors and mineral enthusiasts to view the natural structure, clarity, and crystal habit before purchase. Each specimen from this locality is unique, reflecting natural geological processes that occurred millions of years ago during the formation of the Dorset coast.

Mineral Identification and Composition

Selenite is a crystalline variety of the mineral gypsum, a hydrated calcium sulfate mineral widely found in sedimentary environments worldwide. The mineral forms through evaporation processes where mineral-rich water leaves behind crystalline deposits.

Key mineralogical properties include:

• Mineral Species: Gypsum

• Variety: Selenite

• Chemical Formula: CaSO₄·2H₂O (Calcium Sulfate Dihydrate)

• Mineral Group: Sulfates

• Crystal System: Monoclinic

• Mohs Hardness: 2

• Lustre: Vitreous to silky

• Transparency: Transparent to translucent

• Cleavage: Perfect cleavage in one direction

Selenite crystals often appear as elongated blades, prismatic crystals, or tabular forms. The name “selenite” derives from the Greek word selene, meaning moon, referencing the mineral’s subtle reflective sheen when illuminated.

Geological Formation of Selenite

Selenite forms within evaporite deposits, where mineral-rich water gradually evaporates and leaves behind crystalline gypsum deposits. This process commonly occurs in shallow marine basins, lagoons, or coastal environments where repeated evaporation cycles concentrate dissolved minerals.

In Dorset, gypsum crystals such as selenite occur within sedimentary clay and marl layers associated with the region’s Jurassic geological formations. Over millions of years, evaporite minerals formed in ancient shallow marine environments that once covered much of southern England.

Subsequent erosion along the Dorset coastline has exposed these geological layers, allowing naturally formed gypsum crystals to be discovered within sedimentary deposits.

Tidmore Point Geological Locality

Tidmore Point is part of Dorset’s well-known Jurassic coastal geology, where layers of marine sediments reveal evidence of ancient environmental conditions. The area contains deposits of clay, marl, and other sedimentary rocks formed during periods of fluctuating sea levels and evaporative conditions.

Minerals such as gypsum formed when seawater became trapped in restricted basins and gradually evaporated, leaving behind crystalline sulfate minerals within the sediment layers. Over geological time, these minerals became embedded within the rock record and can occasionally be found as natural crystal specimens.

British mineral localities such as Tidmore Point are of particular interest to collectors due to their connection with the region’s famous Jurassic Coast geological heritage.

Crystal Structure and Visual Characteristics

Selenite crystals are valued for their delicate clarity and natural crystal habit. Many specimens display elongated blades or prismatic crystals with smooth surfaces and visible growth striations along the crystal length.

The mineral’s internal structure allows light to pass through thinner sections, creating a soft internal glow when illuminated. This translucent quality makes selenite specimens visually striking when displayed under natural light.

Individual crystals often show natural variations in thickness, termination shape, and internal texture, all of which reflect the environmental conditions present during crystal growth.

Collecting and Display

British mineral specimens are highly valued among collectors, particularly when sourced from recognised geological localities. Selenite crystals from Dorset represent a unique addition to UK mineral collections, geological teaching collections, or coastal mineral displays.

Because gypsum is relatively soft compared to many minerals, specimens are typically handled with care to preserve their crystal faces and edges. When properly displayed, the natural transparency and crystal structure of selenite can be clearly appreciated.

Collectors often seek locality specimens such as this due to their geological significance and connection to well-known British fossil and mineral regions.

Cultural and Traditional Associations

Selenite has appeared historically in decorative mineral collections and in various cultural traditions. In some traditions, it is traditionally associated with clarity and reflective symbolism, references that relate to the mineral’s luminous appearance. These associations reflect historical cultural perspectives rather than scientific properties.

Authenticity and Certificate of Authenticity

This specimen is a genuine natural British mineral crystal. Each purchase includes a Certificate of Authenticity lifetime guarantee generic card, confirming the authenticity of the mineral specimen.

The photographs in the listing display the exact crystal you will receive, ensuring collectors know precisely which specimen they are purchasing.

Size and Specimen Details

Please refer to the listing photographs for full sizing and scale of the specimen. Images are provided to clearly show the crystal habit, surface texture, and natural mineral structure.

This British selenite crystal from Tidmore Point, Dorset represents a fascinating example of evaporite mineral formation within the Jurassic sedimentary geology of southern England, making it an excellent addition to any mineral collection, geological display, or natural history cabinet.