Description
Dogtooth Calcite Crystals on Quartz Matrix – Mineral Specimen
This impressive specimen features sharply formed Dogtooth Calcite crystals elegantly perched on a contrasting quartz matrix. The combination of elongated calcite crystal points with the underlying quartz base creates a visually striking natural formation, offering both geometric precision and textural contrast in a single piece.
You will receive the exact specimen shown in the photographs, carefully selected for its crystal structure, clarity, and overall aesthetic appeal. This specimen includes a Certificate of Authenticity lifetime guarantee card, confirming it as a genuine natural mineral.
Geology and Mineral Composition
This specimen consists of calcite (CaCO₃) crystals growing on a quartz (SiO₂) matrix, representing two of the most common and geologically significant minerals found within the Earth’s crust. Calcite is a calcium carbonate mineral, while quartz is a crystalline form of silicon dioxide.
Dogtooth calcite refers to a specific crystal habit known as scalenohedral, where the crystals form elongated, pointed shapes resembling canine teeth. These distinctive crystals contrast beautifully with the quartz matrix, which typically forms as a microcrystalline or crystalline base.
Formation and Geological Environment
Dogtooth calcite crystals commonly form in hydrothermal environments where mineral-rich fluids circulate through fractures and cavities within rock. As calcium-rich solutions cool and deposit minerals, calcite begins to crystallise, often forming well-defined scalenohedral crystals.
The quartz matrix typically forms earlier or alongside calcite in silica-rich conditions, providing a stable base upon which later calcite crystals can grow. This sequence of mineral deposition results in layered mineral assemblages, with quartz forming the foundation and calcite developing as a secondary phase.
Such formations are often found in limestone cavities, hydrothermal veins, or geodes, where sufficient space allows crystals to develop freely.
Crystal Habit and Structure
The calcite crystals exhibit a classic scalenohedral habit, characterised by sharply pointed, elongated forms that taper to distinct terminations. These “dogtooth” crystals may grow individually or in clustered arrangements, often radiating from the matrix.
Calcite crystallises in the trigonal crystal system and is known for its perfect cleavage, although in crystal form it displays well-developed faces and sharp edges. The quartz matrix beneath may display fine crystalline texture or small druzy crystals, adding sparkle and depth to the specimen.
The interplay between the angular calcite crystals and the more granular or crystalline quartz base enhances the overall structure and visual complexity.
Colour and Surface Characteristics
Dogtooth calcite crystals can range from clear and colourless to milky white, honey-toned, or lightly tinted depending on trace elements and inclusions. The crystals often exhibit a vitreous to slightly pearly lustre, reflecting light along their sharp faces.
The quartz matrix typically appears white, grey, or translucent, sometimes with a subtle sparkle if fine crystals are present. Natural inclusions or internal zoning within the calcite may add further character, creating depth within the crystal structure.
Surface Features and Natural Texture
As a natural specimen, the surface may show minor contact points where crystals have grown together or against surrounding rock. These features are part of the natural formation process and contribute to the authenticity of the piece.
The base matrix may retain rough or uneven areas, contrasting with the smoother, more reflective surfaces of the calcite crystals above.
Collecting and Display
Dogtooth calcite on quartz matrix is highly valued by collectors due to its distinctive crystal habit and the attractive combination of two classic minerals. The sharp, sculptural appearance of the calcite crystals makes this specimen particularly suitable for display.
It is ideal for mineral cabinets, educational collections, or as a decorative natural piece. The contrast between crystal forms and textures ensures it stands out in any setting.
Authenticity and Presentation
This Dogtooth Calcite on Quartz Matrix specimen is a genuine natural mineral and includes a Certificate of Authenticity lifetime guarantee card. The specimen has been carefully selected, and the photographs show the exact piece you will receive. For full sizing details, please refer to the images provided.
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