mineral
Mixed garnet crystal specimens
Garnet-group silicates, likely almandine–spessartine with possible grossular/pyrope varieties; general formula X₃Y₂(SiO₄)₃
AI-generated identification · may be incorrectSmall rounded to dodecahedral crystals, mostly dark red, burgundy, brown, and black with minor green grains; typically vitreous to resinous luster and no cleavage. Garnet hardness is about 6.5–7.5 Mohs, with specific gravity roughly 3.5–4.3.
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Physical properties
Small rounded to dodecahedral crystals, mostly dark red, burgundy, brown, and black with minor green grains; typically vitreous to resinous luster and no cleavage. Garnet hardness is about 6.5–7.5 Mohs, with specific gravity roughly 3.5–4.3.
Formation & geological history
Garnets form mainly in metamorphic rocks such as schist and gneiss, though some occur in igneous rocks and alluvial deposits. Their precise age and locality cannot be determined from the photograph.
Uses & applications
Gem-quality garnet is cut for jewelry; industrial garnet is used as abrasive, sandblasting media, water-jet cutting material, and filtration media. Specimen value depends strongly on species, color, transparency, locality, and crystal quality.
Geological facts
Red almandine and orange spessartine are common garnet varieties; green garnets may include grossular or demantoid. Garnets are commonly recognized by their lack of cleavage and high density.
Field identification & locations
Identify using crystal form, heft, hardness, and absence of cleavage; a streak, refractive-index, or laboratory test is needed for species-level identification. Garnets occur worldwide, notably in India, Sri Lanka, Madagascar, Tanzania, Kenya, Brazil, the United States, and Norway.
