British Selenite Crystal Tidmore Point Dorset UK Gypsum Mineral Natural Coastal Formation Genuine with Certificate of Authenticity

Natural British Selenite Crystal from Tidmore Point, Dorset

This genuine British Selenite crystal specimen was discovered at Tidmore Point, Dorset, United Kingdom, a coastal location known for its Jurassic sedimentary geology and occasional mineral discoveries within the clay-rich strata. Carefully selected for its natural crystal structure and mineral character, this specimen represents an authentic piece of British geological history.

The listing photographs show the exact specimen you will receive, allowing collectors to view the crystal’s natural structure, surface texture, and clarity before purchase. Each specimen is naturally unique, reflecting the environmental conditions present during its formation within the sedimentary layers along the Dorset coastline.

Mineral Identification and Scientific Classification

Selenite is a transparent to translucent crystalline variety of gypsum, a hydrated calcium sulfate mineral widely found in sedimentary evaporite environments. Gypsum forms when mineral-rich water evaporates and dissolved calcium and sulfate ions crystallise into layered deposits.

Important mineralogical details include:

• Mineral Species: Gypsum

• Variety: Selenite

• Chemical Formula: CaSO₄·2H₂O

• Mineral Group: Sulfates

• Crystal System: Monoclinic

• Mohs Hardness: 2

• Lustre: Vitreous to silky

• Transparency: Transparent to translucent

• Cleavage: Perfect cleavage along one plane

Selenite crystals are known for their distinctive elongated or blade-like forms, often displaying smooth surfaces with visible striations that reflect the mineral’s growth structure.

The name “selenite” comes from the Greek word selene, meaning moon, referencing the mineral’s soft reflective glow when light passes through its translucent crystal structure.

Geological Formation in Dorset Sedimentary Deposits

The geology of Dorset forms part of the internationally recognised Jurassic Coast, where extensive sequences of sedimentary rocks record marine environments dating back over 150 million years. Within these layers, minerals such as gypsum formed under evaporitic conditions.

Selenite crystals typically develop in evaporite environments, where seawater trapped within shallow basins gradually evaporates, concentrating dissolved minerals. As evaporation progresses, calcium sulfate precipitates and forms gypsum crystals within the surrounding sediments.

At Tidmore Point, these crystals occur within clay and marl layers, where the right combination of mineral-rich water and slow crystallisation conditions allowed gypsum crystals to grow within small cavities or fractures in the sediment.

Over geological time, coastal erosion has exposed these layers, occasionally revealing selenite crystals embedded within the sedimentary rock.

Crystal Structure and Visual Characteristics

Selenite crystals commonly grow as elongated blades, tabular crystals, or prismatic formations. Many specimens display internal layering and faint growth striations along the crystal length, which are characteristic of gypsum crystal development.

The mineral’s translucent nature allows light to pass through thinner areas of the crystal, creating a gentle internal glow that enhances the crystal’s visual appeal when displayed under natural lighting.

Individual crystals may vary in thickness, surface texture, and termination shape, reflecting the specific environmental conditions during their formation within the sediment.

Geological Significance and Collecting Interest

British mineral specimens are highly valued by collectors, particularly when they originate from well-documented geological localities. Specimens from Dorset’s Jurassic Coast region are especially notable due to the area’s global geological importance.

Selenite crystals from Tidmore Point provide a tangible connection to the sedimentary processes that shaped southern England during the Jurassic period. For mineral collectors, locality specimens such as this represent both geological interest and regional heritage.

These crystals are often displayed in mineral collections, geological teaching collections, natural history displays, or collector cabinets, where their delicate crystal habit and translucent structure can be appreciated.

Because gypsum is a relatively soft mineral compared to quartz or feldspar, specimens are typically handled carefully to preserve their natural crystal edges and surfaces.

Cultural and Traditional Associations

Throughout history, selenite has appeared in decorative mineral collections and has been referenced in various cultural traditions. In some spiritual traditions, it is traditionally associated with ideas of clarity and reflective symbolism, inspired by the mineral’s luminous appearance. These interpretations represent cultural perspectives rather than scientific properties.

Authenticity and Certificate of Authenticity

This crystal is a genuine natural mineral specimen collected from Tidmore Point, Dorset, UK. Each purchase includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the specimen is a real mineral.

The crystal displayed in the listing photographs is the exact piece you will receive, ensuring transparency for collectors and buyers.

Size and Specimen Details

Please refer to the listing photographs for full sizing and scale of the specimen. Images clearly show the crystal’s natural structure, surfaces, and overall form so collectors can evaluate the specimen before purchase.

This British selenite crystal from Tidmore Point, Dorset represents a classic example of gypsum formation within Jurassic sedimentary geology and makes a distinctive addition to any mineral collection, coastal geological display, or natural history cabinet.