Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Crystalline Quartz (SiO2) with iron impurities
mineral
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
igneous
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Jasper Agate (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Serpentine with Quartz Vein
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4 with SiO2 veins
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Quartz (Milky/Opaque variety)
Silicon Dioxide (SiO2)
mineral
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
sedimentary
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Red)
Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)
igneous
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Malachite and Azurite on Matrix
Cu2CO3(OH)2 (Malachite) / Cu3(CO3)2(OH)2 (Azurite)
mineral
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Amber
Fossilized Tree Resin (Generic formula: C10H16O)
mineral
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
mineral
Basalt with Weathered Rind
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Unakite
Epidotized Granite
metamorphic
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Pyrite in Limestone
Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)
mineral
Agate (Polished Slice)
Banded Chalcedony (SiO2)
mineral
Septarian Nodule
Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)
sedimentary
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic