Rock Identifier
Fuchsite in Quartz (K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2) — Metamorphic Rock / Mineral Association
Metamorphic Rock / Mineral Association

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2

AI-generated identification · may be incorrect

Fuchsite (green muscovite mica) has a Mohs hardness of 2-2.5, pearly to vitreous luster, monoclinic crystal structure, perfect cleavage. Quartz has a hardness of 7, vitreous luster, hexagonal crystal structure, conchoidal fracture. Color is pale to emerald green (fuchsite) mixed with white/clear (quartz).

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Physical properties

Fuchsite (green muscovite mica) has a Mohs hardness of 2-2.5, pearly to vitreous luster, monoclinic crystal structure, perfect cleavage. Quartz has a hardness of 7, vitreous luster, hexagonal crystal structure, conchoidal fracture. Color is pale to emerald green (fuchsite) mixed with white/clear (quartz).

Formation & geological history

Formed through regional metamorphism of chromium-bearing rocks, often associated with hydrothermal alteration. Geologically found in metamorphic terranes.

Uses & applications

Used primarily as an ornamental stone, for lapidary work (cabochons, carvings), and collected by mineral enthusiasts. Occasionally used for its chromium content.

Geological facts

Fuchsite gets its green color from trivalent chromium replacing aluminum in the muscovite structure. It is sometimes trade-named 'Green Muscovite'.

Field identification & locations

Identified by the distinct sparkly, flaky green patches (fuchsite mica) embedded in harder, typically white or translucent quartz. Common in Brazil, India, and parts of the USA.

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Other metamorphic rock / mineral association specimens

Dumortierite in Quartz (Silicon Dioxide with Aluminium Borosilicate (SiO2 + (Al,Fe7+)7(BO3)(SiO4)3O3)) — mineral

Dumortierite in Quartz

Silicon Dioxide with Aluminium Borosilicate (SiO2 + (Al,Fe7+)7(BO3)(SiO4)3O3)

mineral
Quartz with Mica and Feldspar (Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)) — igneous

Quartz with Mica and Feldspar

Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)

igneous
Epidote (Greenstone) (Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) — metamorphic

Epidote (Greenstone)

Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)

metamorphic
Epidote or Unakite Rock (Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)) — metamorphic

Epidote or Unakite Rock

Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)

metamorphic
Epidote (Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))) — mineral

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

mineral
Serpentine ((Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

(Mg,Fe)3Si2O5(OH)4

metamorphic