Black Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Mineral Like (Anthropogenic)
Browse mineral like (anthropogenic) specimens identified by the Rock Identifier community.
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Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Nickel
Nickel (Ni)
mineral
Calcite on Host Rock
Calcium Carbonate (CaCO3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Cobaltian Calcite
Cobalt-bearing Calcite (Ca,Co)CO3
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Gneiss
Gneiss
metamorphic
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Yellow Aventurine
Silicon Dioxide (Quartz with inclusions of Mica or Pyrite), SiO2
metamorphic
Purple Lepidolite with Quartz
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Eudialyte
Na15Ca6(Fe2+,Mn2+)3Zr3(Si,Nb)Si25O73(O,OH,H2O)3(Cl,OH)2
mineral
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Yellow Ochre / Limonite
FeO(OH)·nH2O (Hydrated Iron Oxide Mix)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Cuprite
Cuprite (Copper(I) oxide, Cu2O)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Hag Stone (Holed Quartzite Pebble)
Quartzite (SiO2 based) with natural vug or erosion hole
sedimentary/metamorphic
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous