Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Category
Mineral With Metamorphic Or Igneous Host
Browse mineral with metamorphic or igneous host specimens identified by the Rock Identifier community.
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Basalt with Epidote/Quartz Vein
Mafic Volcanic Rock with Hydrothermal Veining
igneous
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Polished brown gemstone, likely jasper or bronzite
Jasper: microcrystalline SiO₂; possible bronzite: (Mg,Fe)SiO₃
mineral
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Likely polished labradorite (small tumbled stone)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Quartz-rich pegmatite (milky quartz with feldspar)
Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase
igneous
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing rock (likely pyrite-rich ore)
Pyrite, FeS₂, in a fine-grained host rock
mineral
Iron-stained quartz vein in altered host rock
Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image
metamorphic
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Igneous
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Serpentinite
Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Banded Pebble (Metamorphic Slate or Gneiss with Quartz Veining)
Metamorphic Rock with Quartz/Calcite Veins
metamorphic
Blue Dumortierite Quartz
Dumortierite in Quartz (AlAl6BSi3O18)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Polished green tumbled stone, likely serpentine
Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)
metamorphic
Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)
Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
sedimentary
Weathered, iron-stained rock (likely sandstone or breccia)
Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Altered Host Rock
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz Vein in Basalt or Porphyry
Silicate-veined volcanic rock
igneous
Massive Quartz
Silicon dioxide (SiO2)
mineral
Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite (Quartz and Feldspar)
Igneous Pegmatite containing SiO2 and KAlSi3O8
igneous
Peach-colored feldspar (likely potassium feldspar)
Orthoclase or microcline, KAlSi₃O₈
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz-rich pegmatite (likely mica-bearing granite)
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica (muscovite/biotite)
igneous
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Ruby (Rough/Raw)
Corundum (Al2O3:Cr)
mineral
Faceted yellow gemstone, likely citrine
Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing
gemstone
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tumbled smoky quartz
Quartz (SiO₂), likely smoky variety
mineral