White quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Likely quartz crystal fragment
Quartz (silicon dioxide, SiO₂)
mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Basalt Arrowhead (worked stone)
Aphanitic mafic volcanic rock (Basalt)
igneous
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (specifically Clear Quartz with iron/hematite staining)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Quartz with inclusions
SiO2
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst geode
Quartz (SiO₂), purple variety colored mainly by iron and irradiation
mineral
Raw quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Rough Garnet in Matrix
Almandine Garnet (Fe3Al2Si3O12)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
metamorphic
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂), likely a translucent massive variety
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Quartz crystal fragment in weathered host rock
Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix
mineral
Uncertain polished mineral specimen
Indeterminate; possibly quartz or feldspar with iron-oxide staining
mineral
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Smoky quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely smoky variety with possible feldspar or matrix inclusions
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Amethyst quartz cluster
Quartz, SiO₂; purple variety amethyst
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Garnet in Matrix
Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Clear Quartz
Silicon Dioxide (SiO2)
Mineral
Granodiorite Core
Granodiorite
igneous
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral