Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Modified) in the encyclopedia
View all →
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Calcite crystal fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Granite
Phaneritic intrusive felsic igneous rock
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Pegmatite (Quartz and Feldspar with Dark Minerals)
Igneous Pegmatite
igneous
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Milky Quartz with Chlorite inclusion
Silicon Dioxide (SiO2) with Chlorite group inclusions
mineral
Tumbled quartz-rich stone (likely milky quartz/quartzite)
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Schist
Schist
metamorphic
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Howlite
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Plagioclase Feldspar (specifically Albite/Oligoclase)
(Na,Ca)(Si,Al)4O8
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone (Quartzite Pebble)
Arenite / Metamorphosed Sandstone (SiO2)
sedimentary
Granite Gneiss
Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)
metamorphic
Phyllite (possibly low-grade greenish slate)
Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula
metamorphic
Likely calcite fragment
Calcite (CaCO₃), possibly limestone or marble
mineral
Weathered iron-rich rock, possibly jasper or ironstone
Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Fluorite Cleavage Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
sedimentary
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
metamorphic