Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Selenite / Gypsum
Gypsum (CaSO4·2H2O)
Mineral
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Schist
Schist (various mineral compositions)
metamorphic
Schist
Mica Schist (variety: Muscovite/Biotite Schist)
metamorphic
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Schist
Schist
metamorphic
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Halite
Halite (Sodium Chloride - NaCl)
Mineral
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Citrine Quartz
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
Mineral
Rose Quartz
Quartz (SiO2) with trace elements of titanium, iron, or manganese
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Igneous
Sandstone
Arenite
Sedimentary
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Jade (likely Nephrite or Jadeite)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
Metamorphic rock (for Nephrite and some Jadeite); Mineral (for Jadeite)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
Mineral
Smoky Quartz
Quartz (SiO₂)
Mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary