Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
Category
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
Bloodstone / Heliotrope
Silicon dioxide (SiO2) with inclusions
Quartz
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Jasper
Silicon dioxide (SiO2) with iron oxide impurities
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Tumbled Black Jasper
Silicon Dioxide (SiO2) with iron and carbon inclusions
Jasper (specifically Green Jasper/Chert)
Jasper (Silicon Dioxide, SiO2)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
Feldspar
Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
Jasper with Epidote
Silicon Dioxide (SiO2) with Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
Quartz
Silicon Dioxide (SiO2)
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·n(H2O)
Dalmation Stone
Peralkaline Rock (Microcline Quartz mixture with Arfvedsonite)
Gneiss
Gneiss
Porphyry
Porphyritic Basalt or Porphyritic Andesite
Fluorite
Calcium Fluoride (CaF2)
Malachite
Copper carbonate hydroxide [Cu2CO3(OH)2]
Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
Quartz
Silicon Dioxide (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Chert / Flint
Silicon Dioxide (SiO2)
Quartz (Druzy)
Silicon Dioxide (SiO2)
Specular Hematite
Hematite (Fe2O3)
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
Clear Quartz
Silicon Dioxide (SiO2)
Quartz (specifically Clear or Rose Quartz)
Silicon Dioxide (SiO2)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz (Milky or Common Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Copper Ore with Malachite and Chrysocolla
Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)