Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Greenstone / Quartzite Pebble
Metamorphosed Quartz-rich Rock
metamorphic
Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartz with Fuchsite (or Chlorite)
SiO2 (Silicon Dioxide) with K(Al,Cr)2(AlSi3O10)(OH)2 (Fuchsite)
mineral
Tumbled jasper, likely picture or brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
gemstone
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Tumbled Dalmatian jasper
Quartz-rich alkali rhyolite, commonly marketed as Dalmatian jasper; chiefly quartz, feldspar, and dark amphibole/biotite inclusions
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Greenstone / Epidosite
Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)
metamorphic
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Veined Siltstone
Siltstone with Quartz (SiO2) intrusion
sedimentary
Green Quartz (Prasiolite / Chlorite-Included Quartz Pebble)
Silicon Dioxide (SiO2) with micro-inclusions
mineral
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Quartzite with Iron Inclusions
Quartzite (SiO2) with Hematite/Limonite
metamorphic
Chert (and/or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper and Basalt (Lake Superior Agate or Jasper Pebble)
Silicified rock / Cryptocrystalline quartz (SiO2) with basalt matrix
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Quartzite
Quartzite (primarily SiO2) with inclusions like Dumortierite or Magnesio-riebeckite
metamorphic
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Serpentine
Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4
metamorphic
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Schorl (Black Tourmaline)
Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Pink Quartz (Inclusion-Rich Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Jasper containing epidote (Unakite-like)
Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Greenstone (likely serpentinite)
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, or other altered minerals
metamorphic
Rose Quartz
Quartz (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Yellow Chert (Gold-colored River Pebble)
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
sedimentary