Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
igneous
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Learn about Metamorphic (Likely Gneiss Or Schist Based On Texture) in the encyclopedia
View all →
Banded Quartzite River Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Fossilized Coral (Petoskey Stone or similar Favosites)
Hexagonaria percarinata / Favosites (Silurian-Devonian Coral)
sedimentary
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Rhyolite Pebble
Rhyolite
igneous
Weathered quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Aquamarine with Ruby Accent
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)
mineral
Diamond
Carbon (C)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
sedimentary
Emerald (Beryl)
Be₃Al₂Si₆O₁₈ (Chromium/Vanadium-bearing Beryl)
gemstone
Green Tourmaline (Verdelite)
Complex sodium iron aluminum borosilicate (Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4)
gemstone
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Yellow Quartzite Pebble
Quartzite (SiO2 with Iron Oxide staining)
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Sandstone
Arenite
sedimentary
Conglomerate
Clastic Sedimentary (Conglomerate)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium aluminum silicate)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Diorite
Intermediate Phaneritic Plutonic Rock - Diorite
igneous
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Weathered sandstone or iron-rich sedimentary fragment
Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)
sedimentary
Tumbled quartz-rich stone, likely milky quartz
Quartz (SiO₂), possibly iron-stained milky quartz or quartzite
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (mostly SiO2)
metamorphic
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Tumbled quartz-rich rock, likely quartzite or milky quartz with iron-oxide staining
Quartzite (primarily SiO₂), possibly with hematite/goethite staining and minor feldspar or mica
metamorphic
Quartzite Cobble with Quartz Vein
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Riverstone (Quartzite/Granite Cobble)
Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite
metamorphic or igneous
Tumbled Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
River Cobble (Quartzite-rich Sandstone)
Clastic Sedimentary Rock (Litharenite/Quartzite transition)
sedimentary
Greenstone (Epidote/Chlorite Schist)
Metabasalt (composed primarily of Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH) and Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Greenstone (or Greywacke/Metasediment Pebble)
Metamorphosed Mafic Rock / Chlorite Schist
metamorphic
Aventurine and Amazonite
Silicon Dioxide (SiO2) with inclusions and Microcline (KAlSi3O8)
Mineral