Metamorphic Rock (Composed Of Multiple Minerals)

Greenstone (Greenschist)

Greenschist (composed of Chlorite, Epidote, and Actinolite)

Granite Gneiss

Gneiss (derived from granitic protolith)

Quartz

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Banded Gneiss (River Cobble)

Gneiss (High-grade regional metamorphic rock)

Sandstone

Arenite (composed primarily of SiO2)

Schist

Mica Schist (Medium-grade metamorphic rock)

Schist

Mica Schist (primarily Muscovite and Quartz)

Bumblebee Jasper

Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcareous biomicrite / Bioclastic limestone

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Vesicular Basalt

Basalt

Unakite (Epidotized Granite)

Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Quartz composition)

Quartz Pebble

Silicon Dioxide (SiO2)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Sandstone

Arenite (primarily SiO2)

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Gneiss (Schistose)

Gneiss

Blue Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Sandstone (likely Arkose)

Arenite (composed mainly of SiO2 with Feldspar)

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Basalt (River Pebble)

Basalt

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Chalcedony in Matrix

Silicon Dioxide (SiO2)