Rock Identifier

Category

Mineral (Man Modified)

Browse mineral (man modified) specimens identified by the Rock Identifier community.

Learn about Mineral (Man Modified) in the encyclopedia

Pyrolusite

Celsian

Dendritic Jasper

Banalsite

Paracelsian

Feldspar

Jade

Serpentinite

Landscape Opal

Dendritic Opal

Calc-schist

Galena

Orbicular Jasper (Silicon Dioxide (SiO2)) — sedimentary

Orbicular Jasper

Silicon Dioxide (SiO2)

Blue-green fluorite (likely tumbled/polished) (Fluorite, calcium fluoride (CaF₂)) — mineral

Blue-green fluorite (likely tumbled/polished)

Fluorite, calcium fluoride (CaF₂)

Weathered pegmatite or feldspar-rich granite fragment (Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph) — igneous

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Sandstone (Quartzose Sandstone) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Fluorite (Fluorite (Calcium Fluoride - CaF2)) — mineral

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Rainbow Fluorite (Calcium Fluoride (CaF2)) — mineral

Rainbow Fluorite

Calcium Fluoride (CaF2)

Limonite (Limonite (FeOO·nH2O)) — mineral

Limonite

Limonite (FeOO·nH2O)

Limonite (Ironstone Concretion) (Hydrous ferric oxides (FeO(OH)·nH2O)) — mineral

Limonite (Ironstone Concretion)

Hydrous ferric oxides (FeO(OH)·nH2O)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Olivine (Peridot) (Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)) — mineral

Olivine (Peridot)

Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Calcite specimen (Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite) — mineral

Calcite specimen

Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite

Milky quartz (rough quartz specimen) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Fluorite on Matrix (Calcium Fluoride (CaF2)) — mineral

Fluorite on Matrix

Calcium Fluoride (CaF2)

Fluorite (likely Fluorite on Quartz/Matrix) (Calcium Fluoride (CaF2)) — mineral

Fluorite (likely Fluorite on Quartz/Matrix)

Calcium Fluoride (CaF2)

Native American Hammerstone / Pitted Stone (Modified lithic artifact (often quartzite, basalt, or granite)) — artifact / sedimentary or igneous rock

Native American Hammerstone / Pitted Stone

Modified lithic artifact (often quartzite, basalt, or granite)

artifact / sedimentary or igneous rock

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Quartzite or Quartz Vein Material (SiO2) — metamorphic

Quartzite or Quartz Vein Material

SiO2

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Limonite Concretion (FeO(OH)qnH2O (Hydrated iron(III) oxide-hydroxide mixture)) — sedimentary

Limonite Concretion

FeO(OH)qnH2O (Hydrated iron(III) oxide-hydroxide mixture)

Granite (Granite (felsic intrusive igneous rock)) — igneous

Granite

Granite (felsic intrusive igneous rock)

Milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

Banded gneiss (Gneiss; typically quartz–feldspar–mica assemblage) — metamorphic

Banded gneiss

Gneiss; typically quartz–feldspar–mica assemblage

Fluorite (Rainbow, Purple-Blue Tumbled) (Calcium Fluoride (CaF2)) — Mineral

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Painted Rock / Geode Specimen (Silicon Dioxide with artificial pigment coating) — mineral

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Fluorite Carving (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite Carving

Fluorite (Calcium Fluoride, CaF2)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Sandstone (various mineral compositions)) — Sedimentary

Sandstone

Sandstone (various mineral compositions)

Howlite (tumbled stone) (Howlite, Ca₂B₅SiO₉(OH)₅) — mineral

Howlite (tumbled stone)

Howlite, Ca₂B₅SiO₉(OH)₅

Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Rainbow Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Botryoidal quartz (likely chalcedony or druzy quartz) (Silicon dioxide, SiO₂; microcrystalline quartz (chalcedony) with possible drusy quartz coating) — mineral

Botryoidal quartz (likely chalcedony or druzy quartz)

Silicon dioxide, SiO₂; microcrystalline quartz (chalcedony) with possible drusy quartz coating

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Fluorite (translucent octahedral crystal) (Calcium fluoride (CaF2)) — mineral

Fluorite (translucent octahedral crystal)

Calcium fluoride (CaF2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Satin Spar (Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Serpentine (Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4) — metamorphic

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4