Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Howlite
Hydrous calcium borosilicate (Ca2B5SiO9(OH)5)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Schist
metamorphic
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite in Quartz (Lithium-bearing Ore)
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) and Quartz (SiO2)
igneous/mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Montana Moss Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper Mushroom Carving
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
metamorphic
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Limonite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O)
mineral
Fossil Snail
Gastropoda fossil
fossil
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Crocidolite
metamorphic
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Green Quartzite
Quartzite (primarily SiO2 with trace impurities)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Geode
Crystalline Quartz (SiO2) within a nodule
sedimentary
Common Opal (Potch)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Fossilized Blastoid (Sea Bud)
Pentremites sp. (Echinodermata, Blastoidea)
fossil
Rhodonite
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Granitic Pegmatite with Graphic Texture
Graphic Granite (alkali feldspar and quartz intergrowth)
igneous
Snowflake Obsidian and Green Aventurine
Volcanic Glass (SiO2 with Cristobalite inclusions) and Quartz (SiO2 with Fuchsite)
igneous and metamorphic
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
igneous