Prehnite
Ca2Al2Si3O10(OH)2
mineral
Category
Igneous And Mineral
Browse igneous and mineral specimens identified by the Rock Identifier community.
Learn about Igneous And Mineral in the encyclopedia
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Gabbro or Diorite with Felsic intrusion
Mafic to intermediate intrusive igneous rock with felsic vein/inclusion
igneous
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Ca2Al2(Fe3+,Al)(SiO43)(Si2O7)O(OH)
mineral
Yellow Topaz
Al2SiO4(F,OH)2
gemstone
Granite
Felsic intrusive igneous rock
igneous
Likely diorite (small hand specimen)
Diorite; chiefly plagioclase feldspar and hornblende, often with biotite
igneous
Porphyry
Porphyritic Igneous Rock
igneous
K-Feldspar Granite Fragment
Granite (Alkali Feldspar-rich)
igneous
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass
igneous
Likely rough garnet crystal
Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Granite
Intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous