metamorphic
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
Hardness 6.5-7.5 (garnet) and 7 (quartz), Color: deep reddish-brown with white/clear matrix, Luster: Vitreous to resinous, Crystal Structure: Isometric (garnet) and Hexagonal (quartz), Cleavage: None/Indistinct
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Physical properties
Hardness 6.5-7.5 (garnet) and 7 (quartz), Color: deep reddish-brown with white/clear matrix, Luster: Vitreous to resinous, Crystal Structure: Isometric (garnet) and Hexagonal (quartz), Cleavage: None/Indistinct
Formation & geological history
Formed at high temperatures and pressures during regional metamorphism of clay-rich sedimentary rocks (pelites). The garnets grew as porphyroblasts within a silica-rich environment.
Uses & applications
Used primarily as rough specimens for mineral collectors, lapidary and jewelry use when gem quality, and industrial abrasives due to high hardness.
Geological facts
Garnets are one of the few minerals that are often found in perfect dodecahedron shapes naturally. This specific variation shows clear Almandine garnets encased in pegmatitic or metamorphic quartz.
Field identification & locations
Identify by looking for dark red crystalline inclusions within white/milky quartz; the garnets are significantly harder than the surrounding quartz matrix in some cases. Commonly found in metamorphic belts like the Adirondack Mountains or the Alps.
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