Agate Slice 2-2.5 Inch Natural Banded Chalcedony Quartz Crystal Polished Mineral Specimen Display Stone

Description

Natural Selenite Bar – Polished Gypsum Mineral Specimen

This Selenite Bar is a natural mineral specimen crafted from the crystalline variety of gypsum known as selenite. Selenite is widely recognised for its fibrous internal structure, soft translucency, and smooth pearly lustre. The mineral has been shaped into a bar form and polished to highlight the natural internal texture and satin-like surface characteristic of this material.

The photographs in the listing show the exact specimen you will receive, allowing buyers and collectors to clearly view the colour, texture, and polished finish of the mineral prior to purchase.

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

Please refer to the listing photographs for full sizing and scale.

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Mineral Identification – Selenite (Gypsum Variety)

Selenite is a crystalline form of gypsum, a hydrated calcium sulfate mineral that belongs to the sulfate mineral group. The name “selenite” refers to the clear or fibrous crystalline variety of gypsum that displays a soft glow or sheen when light passes through the mineral.

Key mineralogical characteristics include:

• Mineral Name: Gypsum

• Variety: Selenite

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

• Mineral Class: Sulfate mineral

• Crystal System: Monoclinic

• Mohs Hardness: Approximately 2

• Transparency: Transparent to translucent

• Lustre: Pearly to silky

Selenite is known for its fibrous or crystalline internal structure, which can produce a soft luminous appearance when light interacts with the mineral surface.

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Geological Formation

Gypsum minerals such as selenite typically form in evaporite environments, where mineral-rich water bodies gradually evaporate over time. As water evaporates, dissolved calcium and sulfate ions combine and crystallise to form gypsum deposits.

Common geological environments where gypsum forms include:

• Evaporating inland seas and salt lakes

• Sedimentary evaporite basins

• Marine lagoon environments

• Hydrothermal mineral systems

In evaporite deposits, gypsum crystals may grow within sediment layers or open cavities where mineral-rich solutions allow crystals to develop freely.

Associated minerals often found in gypsum deposits include:

• Halite (rock salt)

• Anhydrite

• Calcite

• Celestine

• Dolomite

These minerals commonly occur together in sedimentary evaporite sequences.

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Crystal Structure and Natural Optical Effects

Selenite is particularly notable for its fibrous crystal structure, which produces optical effects as light passes through the mineral. When polished, these fibres can create a soft internal glow or subtle banding effect.

Typical natural features seen in selenite include:

• Fine fibrous internal growth patterns

• Translucent white or colourless tones

• Silky or pearly surface lustre

• Natural internal striations

The bar shape enhances the visibility of these internal structures by presenting a smooth polished surface.

Because gypsum is relatively soft compared to many minerals, it can be shaped and polished while retaining its natural internal crystal character.

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Selenite Bar Form

This specimen has been cut and polished into a bar shape, a popular lapidary style that emphasises the mineral’s natural translucency and fibrous texture.

Polished selenite bars are appreciated for their:

• Smooth satin-like surface

• Soft translucent glow when light passes through

• Clean geometric shape suitable for display

• Natural mineral texture

The polishing process enhances the mineral’s appearance while preserving its natural composition.

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Mineral Collecting and Display

Selenite specimens are widely collected due to their distinctive optical qualities and geological significance as evaporite minerals. Their soft lustre and crystalline structure make them visually distinctive compared to many other minerals.

This mineral specimen may be suitable for:

• Mineral and crystal collections

• Geological teaching displays

• Evaporite mineral collections

• Decorative mineral displays

• Unique natural gift items

In some cultural traditions, crystals and minerals are traditionally associated with symbolic or spiritual interpretations, although such interpretations are belief-based rather than scientific explanations.

Because the listing photographs show the actual specimen, buyers can purchase confidently knowing the exact mineral they will receive.

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Authentic Natural Mineral Specimen

This Selenite Bar is a genuine gypsum mineral specimen, carefully selected for its natural translucency and polished finish.

The crystal includes a Certificate of Authenticity lifetime guarantee generic card, confirming the authenticity of the mineral specimen.

Please review the listing photographs for full sizing and scale, as they form part of the description and clearly show the exact specimen you will receive.