#002: Calcite
Specimen Entry No. 002 logs a remarkable batch of hand-selected Optical Calcite rhombohedrons, celebrated for their exceptional glass-like clarity and geometric perfection[cite: 1]. When caught by direct light, the internal cleavage planes of these crystalline blocks act as natural prisms, scattering light into vivid, shimmering rainbow fields beneath the surface plane[cite: 1]. Each piece features distinct, naturally occurring internal fractures and structural steps that make its light play completely unique[cite: 1]. Holding these specimens reveals a smooth, cool weight and a fascinating geological artistry that has captivated collectors for centuries[cite: 1].
Analytical Breakdown Notes
Pattern & Transparency ►
The defining geometry of these specimens is a direct result of rhombohedral cleavage, where the mineral naturally splits along three distinct planes of structural weakness to form perfect angled blocks[cite: 1]. This outstanding optical transparency allows light to travel completely unhindered through the mineral matrix until it strikes internal twin boundaries[cite: 1]. These microscopic interfaces refract the incoming light beams, splitting them into beautiful, localized rainbow spectrums that shift dynamically depending on your viewing angle[cite: 1].
Variety & Mineral Group ►
As a premier variety within the carbonate mineral group, this optical-grade calcite consists of highly pure calcium carbonate crystallized under remarkably stable subterranean conditions[cite: 1]. The lack of trace metallic impurities preserves its water-clear presentation, while its characteristic low Mohs hardness rating of 3 gives it a delicate, glass-smooth surface texture[cite: 1]. This pure molecular arrangement is historically famous for its strong double refraction, famously shifting and doubling visual lines viewed through its crystal matrix[cite: 1].
Estimated Age ►
Geological indicators trace the formation window of this crystalline lot back approximately 30 million years to the Oligocene epoch, developing within low-temperature hydrothermal veins[cite: 1]. As mineral-dense fluids slowly cooled inside protective limestone cavities, the calcium and carbonate ions had the ideal span of time to lock into their highly orderly trigonal frameworks[cite: 1]. This undisturbed, slow-growth environment is exactly what allowed such large, optically clear crystals to grow without being clouded by muddy sedimentary debris[cite: 1].
Deposits ►
The raw material for Index No. 002 is compiled from notable global carbonate pockets across Iceland, Mexico, and China, where high-grade optical crystals are recovered from deep pockets[cite: 1]. Minor regional environment variations can occasionally introduce tiny wisps of localized phantom inclusions or subtle milky veining along the outer edges of a specimen[cite: 1]. These trace geographical markers do not disrupt the overall clarity, but instead serve as authentic signatures of the specific pocket where the piece was mined[cite: 1].
Order Information
Shipping & Delivery ►
Estimated Delivery Windows:
- United States: 7 to 12 Business Days
- Canada: 8 to 14 Business Days
- United Kingdom: 7 to 10 Business Days
- Europe: 8 to 14 Business Days
- Australia & New Zealand: 10 to 15 Business Days
- International / Rest of World: 12 to 20 Business Days
Packaging & Protection ►
We protect every specimen carefully using high-density foam padding. This prevents fragile crystal structures or polished surfaces from shifting, chipping, or cracking while on the way to you.
Verified Suppliers Only ►
We partner exclusively with trusted sources who meet our strict ethical and quality standards.
Sizing & Measurements ►
Dimensions are taken at the widest points of the stone, and weights are measured to the exact gram. Because these are natural geological pieces, minor variations in texture, pattern, and shape are completely normal.