Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Category
Browse mineral (impactite) specimens identified by the Rock Identifier community.
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Tumbled purple jasper (likely)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron and other trace minerals
Limonite (Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
Quartz Vein in Host Rock (Gossanous Matrtix)
Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)
Quartz Pebble
Silicon Dioxide (SiO2)
Carved Gemstone Mushroom
Quartz / Feldspar composite (Carved lapidary art)
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
Dendritic sandstone
Sandstone with Manganese Oxide dendrites
Agate
Silicon Dioxide (SiO2)
Sandstone
Arenite
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
Native Copper
Native Copper (Cu)
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite
Gossan (Limonite/Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
Fluorite
Calcium Fluoride (CaF2)
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Chalcopyrite in Quartz matrix
Chalcopyrite (CuFeS2) with secondary Malachite (Cu2CO3(OH)2)
Sandstone
Arenite (SiO2 primarily)
Turquoise
CuAl6(PO4)4(OH)8·4H2O
Pyrite
Iron Disulfide (FeS2)
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
Sulfur on Quartz
Native Sulfur (S8) with Quartz (SiO2)
Azurite
Azurite (Cu3(CO3)2(OH)2)
Fossil shark teeth
Likely fossilized shark teeth, possibly Carcharhiniformes or related sharks; exact species cannot be determined from the photo.
Copper Ore (Malachite/Chrysocolla bearing)
Cupriferous rock containing secondary copper minerals like Cu2CO3(OH)2
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
Blue Apatite
Calcium Fluorophosphate (Ca5(PO4)3F)
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Fluorite
Calcium fluoride (CaF2)
Fluorite
Calcium Fluoride (CaF2)
Green Fluorite
Calcium Fluoride (CaF2)
Green Fluorite
Calcium Fluoride (CaF2)