Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded metamorphic rock, likely schist or gneiss
Foliated quartz–feldspar–mica rock; exact mineral identification requires sampling
metamorphic
Polished opal-bearing rock (likely boulder opal)
Opal, hydrated amorphous silica (SiO₂·nH₂O), in ironstone or host rock
gemstone
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary/igneous host
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Yellow quartz fragment (likely citrine or iron-stained quartz)
Quartz, silicon dioxide (SiO₂), trigonal crystal system
mineral
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
mineral
Milky quartz in weathered host rock
Quartz, SiO₂; likely a quartz vein in altered country rock
mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Iron-stained quartz pebble
Quartz (SiO₂), likely microcrystalline or massive quartz with goethite/limonite staining
mineral
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Healer's Gold (Pyrite and Magnetite in Schist)
Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist
metamorphic
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Mica-rich rock, likely mica schist
Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Mixed River Pebbles
Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Weathered quartz-rich metamorphic rock (probable gneiss or quartzite)
Biotite–quartz–feldspar gneiss, possibly micaceous quartzite
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Likely quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Unknown Rock Fragment
Undetermined
igneous
Weathered sandstone fragment
Clastic sandstone, likely quartz-rich (quartz arenite or arkose)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Rough garnet-bearing metamorphic rock
Likely garnet amphibolite or garnet-bearing schist; garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)
metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
sedimentary
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock or quartz specimen
Quartz (SiO₂), likely massive quartz or quartz-bearing host rock
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica or chlorite
mineral