Schist
Schist (Crystalline metamorphic rock)
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Mixed river-worn rock collection
Uncertain; likely quartzite, sandstone, basalt, and weathered granite or gneiss
igneous, sedimentary, metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Granodiorite (Water-worn Pebble)
Granodiorite
igneous
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Extrusive Igneous Rock
igneous
Biotite-bearing gneiss or schist
Quartz–feldspar–mica metamorphic rock, likely mica schist/gneiss
metamorphic
Mixed tumbled river pebbles and beach stones
Polymictic alluvial gravel; components include quartz, chert, jasper, sandstone, and altered volcanic rocks
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Muscovite Mica (on Quartz Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Milky quartz (rough quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt
Extrusive igneous rock
igneous
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Diorite (River Cobble)
Diorite (Intrusive Igneous Rock)
igneous
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Basalt Breccia
Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)
igneous
Basalt Pebble
Basalt
igneous
Tumbled yellow quartz (likely citrine)
Quartz, silicon dioxide (SiO₂), iron-colored variety
mineral
Pink Granite (Gneissic transition)
Pink Biotite Granite
igneous
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Agate Geode
Chalcedony (cryptocrystalline SiO2)
mineral
Mica (Muscovite)
Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2
mineral
Basalt Pebble
Extrusive mafic igneous rock
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Muscovite mica
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
mineral
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Granodiorite
Phaneritic Granodiorite
igneous
Granodiorite
Phaneritic Plutonic Granodiorite
igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Basalt pebble
Aphanitic Mafic Volcanic Rock (Fe/Mg rich)
igneous