Pyrite
Iron Disulfide (FeS2)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Gypsum (Selenite sand)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Malachite
Copper Carbonate Hydroxide (Cu2CO3(OH)2)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Quartz-rich pegmatite, likely with iron staining
Granitic pegmatite, chiefly quartz (SiO₂) and feldspar, with possible mica and iron oxides
igneous
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Quartz crystal cluster (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂), with possible iron-oxide inclusions
mineral
Blue apatite (likely dyed or enhanced)
Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety
mineral
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Mica Schist / Granite
Mica Schist (Silicate metamorphic rock)
metamorphic
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Erythrite in Cobaltite Ore
Erythrite (Co3(AsO4)2·8H2O) with Cobaltite (CoAsS)
mineral
Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation
igneous
Garden Quartz (Lodalite)
Silicon Dioxide with various mineral inclusions (SiO2)
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
sedimentary (volcanic)
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Granite
Granite
igneous
Biotite gneiss (probable)
Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar
metamorphic
Copper Ore
Mixed copper sulfides/oxides in gangue matrix
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered granite or granitic gneiss
Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Likely amphibolite
Amphibolite, composed mainly of hornblende and plagioclase feldspar
metamorphic
Granite
Coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Vesicular Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock)
Igneous
Gneiss
Gneiss
metamorphic
Epidote
Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))
mineral