Agate (Chalcedony Variation)
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
sedimentary
Fluorite (Rainbow or Multi-colored Fluorite)
Fluorite (Calcium Fluoride - CaF2)
mineral
Druzy Quartz Geode (Vug)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Diorite
Intermediate plutonic igneous rock
igneous
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Oolitic Chert
Ooidal Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Unakite
Unakite (Epidotized Granite)
metamorphic
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Copper Ore with Malachite and Chrysocolla
Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Gneiss
Gneiss
metamorphic
Unakite
Unakite (Metasomatized Granite)
metamorphic
Gabbro
Gabbro (Mafic Plutonic Rock)
igneous
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite
sedimentary
Sandstone with Iron Oxide (Limonite/Hematite)
Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Tiger's Eye
Pseudomorph of Crocidolite (SiO2 with iron oxides)
mineral
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Pyrite in Shale
Iron Sulfide (FeS2) in Sedimentary Matrix
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral