Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Category
Mineral (Native Element Alloy)
Browse mineral (native element alloy) specimens identified by the Rock Identifier community.
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Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Granite
Granite
igneous
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Sandstone (with potential mineral inclusions)
Clastic sedimentary rock (primarily Quartz, SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Hematite (Concretion)
Iron(III) oxide (Fe2O3)
mineral
Orthoclase Feldspar (Twinning Specimen)
Orthoclase (KAlSi3O8)
mineral
Granodiorite
Granodiorite
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Blue Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Eudialyte in Matrix
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite
igneous
Pink-and-green quartz-rich rock, likely rose quartz with epidote/serpentine
Quartz (SiO₂), variably colored by iron, with possible epidote, chlorite, or serpentine inclusions
mineral
Granitic Pegmatite
Granitic Pegmatite (primarily SiO2 with KAlSi3O8)
igneous
Granitic Pegmatite
Granite Pegmatite (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Muscovite)
Igneous
Schist
Mica Schist
metamorphic
Amethyst
Silicon dioxide / Violet Quartz (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Desert Rose (Sand Barite/Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral