Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary And Igneous
Browse sedimentary and igneous specimens identified by the Rock Identifier community.
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Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
André Landed Here Rock (Glacial Erratic)
Granodiorite / Diorite (compositional estimate)
igneous
Porphyritic Igneous Rock with Iron Oxide Weathering
Weathered Porphyry (containing Quartz, Feldspar, Amphibole/Biotite, and Hematite/Limonite)
igneous
Basalt (or similar Mafic Igneous Rock)
Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Pink Granite Pebble
Granite
igneous
Pink Granite
Phaneritic Igneous Rock (Quartz-Feldspar-Mica)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
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.
Metamorphic Rock
Granite and Igneous Mix
Phaneritic Felsic to Mafic Intrusive Rocks
igneous
Calcite
Calcite (CaCO₃)
Mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Siltstone / Slate
Siltstone / Low-grade Slate
sedimentary
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Porphyritic Granite (Pink Granite)
Granite (plagioclase, alkali feldspar, quartz, biotite)
igneous
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rose Quartz
Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Diorite
Diorite
igneous
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Wishing Stone (Quartz-Veined Basalt)
Amygdaloidal Basalt with Quartz (SiO2) vein
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)
igneous
Granite
Granite
igneous