Amethyst
Quartz (SiO2)
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
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Emerald in Quartz Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
gemstone
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Schist with Quartz Veins
Schist with Quartz (SiO2)
metamorphic
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Granite
Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase
igneous
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Moonstone
Orthoclase (Potassium Feldspar), (K,Na)AlSi3O8
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Slate
Slate (Metamorphic Rock)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Rock Fragment with Calcite/Quartz Vein
Polymictic Rock Fragment (SiO2 / CaCO3)
igneous
Copper Ore (Chrysocolla/Malachite in host rock)
Hydrated copper phyllosilicate and copper carbonate hydroxide
mineral
Granite
Felsic intrusive igneous rock
igneous
Sandstone (Tumbled / Rounded)
Sedimentary Rock (Quartz arenite)
sedimentary
Granite or Pegmatite in host rock
Granitoid / Felsic Intrusive Rock
Igneous
River Rock (Greywacke/Sandstone)
Arenite / Lithic Sandstone
sedimentary
Quartz Geode or Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)
Veined Metabasalt / Veined Greywacke
metamorphic
Quartz vein rock with iron-stained matrix
Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
mineral
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
igneous
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
mineral
Raw Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Weathered basaltic rock (probable basalt)
Basalt; fine-grained mafic silicate rock, commonly plagioclase + pyroxene ± olivine
igneous
Milky quartz–rich rock
Quartz (SiO₂), likely massive milky quartz with minor dark inclusions
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Mixed Crushed Stone
Aggregate (varied mineral composition)
igneous and sedimentary mixture
Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous