Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Category
Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Quartz (Milky/Cloudy Variety)
Silicon Dioxide (SiO2)
mineral
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Pyrite (Iron Pyrite) with Goethite Oxidation
Iron Sulfide (FeS2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Gneiss
High-grade regional metamorphic Gneiss
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Yellow Quartz (Citrine Quartz or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Jasper variant)
Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)
sedimentary
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
White Chalcedony (likely Common Opal or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Amethyst (Quartz)
SiO2 (Silicon Dioxide)
mineral
Turquoise (beads)
Turquoise; CuAl6(PO4)4(OH)8·4H2O
Mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Dolomite
Dolomite (CaMg(CO3)2)
Mineral
Breciated Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Pebble (Milky and Gray)
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Dalmatian Jasper (Dalmatian Stone)
Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)
igneous
Quartz (Fieldstone/Pebble)
Silicon Dioxide (SiO2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Shale
Shale
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
metamorphic
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment