Copper-bearing Quartz (likely Chrysocolla or Malachite staining)
Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Chert (Black Chert/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Red Granite
Phaneritic Felsic Igneous Rock
igneous
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Zebra Jasper
Silicon dioxide (SiO2) with various impurities
Sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Chert
Chert (microcrystalline quartz, SiO2)
Sedimentary
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Lapis Lazuli
Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Gneiss
Gneiss
metamorphic
Vesicular Basalt
Basalt (with vesicular texture)
igneous
Quartz (specifically Milky Quartz/Quartzite)
Silicon Dioxide (SiO2)
Mineral
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Lava Stone and Chakra Beads
Basalt (with various mineral/synthetic beads)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions
mineral
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Chert
Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)
Sedimentary