Granite
Phaneritic Felsic Igneous Rock
igneous
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Sunstone with Moonstone (Peach Moonstone)
Orthoclase Feldspar (KAlSi3O8)
mineral
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
Amethyst (Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Banded Calcite (Mexican Onyx)
Calcite (CaCO3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2
mineral
Fluorite (translucent octahedral crystal)
Calcium fluoride (CaF2)
mineral
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Ferruginous Sandstone (Gozzan-like)
Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)
sedimentary
Amber (Simulated/Faturan Style)
Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)
Organic Gemstone (not a mineral)
Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Obsidian
Obsidian (Volcanic Glass, complex silicate)
igneous
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Organic Gemstone)
mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Quartz / Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Amber
Succinite (a common variety of fossilized resin)
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Granite
Granite (Alkali-feldspar, Quartz, and Plagioclase composition)
igneous
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary