Amethyst
Violet quartz with glassy luster and conchoidal fracture. Classic hexagonal prism terminations with color zoning from iron irradiation.
None (Conchoidal)
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Browse practical identification notes, mineral facts, care guidance, and clearly labeled traditional symbolism. Rigorous mineralogy balanced with historical reverence.
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Rose Quartz
Soft pink color from microscopic mineral inclusions, usually massive without crystal faces. Displays hazy translucence and gentle luster.
Massive / Granular
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Citrine
Pale golden to deep amber quartz point; natural citrine displays subtle dichroism and clear crystalline structures without burnt white bases.
Vitreous / Transp.
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Black Tourmaline
Dense black prismatic crystals with vertical striations (ridges) along edges. Features pyroelectric and piezoelectric charge retention.
Prismatic Striated
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Clear Quartz
Transparent hexagonal prism terminating in a 6-sided pyramid point. Pure silicon dioxide with glassy luster and zero cleavage planes.
Trigonal
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Purple Fluorite
Distinct cubic cleavage steps; much softer than quartz and easily scratched by copper/iron. Exhibits brilliant UV fluorescence.
Octahedral (Perfect)
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Lepidolite
Lilac purple scaly/flaky micaceous sheets with pearly luster, flakes off with a fingernail. Rich in lithium; delicate physical cohesion.
Basal Perfect (Sheet)
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Tiger's Eye
Silky chatoyancy (cat's eye effect) with warm golden-brown parallel fibrous bands. Crocidolite asbestos completely replaced by quartz.
Chatoyancy
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Not sure what stone you have?
Answer five visual questions about color streak, transparency, luster, and surface cleavage in our guided specimen identifier to accurately diagnose raw or tumbled minerals.
Browse Index A–Z
Alphabetical reference directory spanning geological specimens and silica minerals.
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Sources & Review
Each published guide lists its mineral references and separates physical properties from historical folklore. Visual guides do not replace professional gemological testing.