Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
Basalt
Mafic Igneous Rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Libyan Desert Glass
Natural Silica Glass (SiO2 with minor iron and titanium)
mineraloid
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Apache Tear
Obsidian (Hydrated Silica Rich Volcanic Glass)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
White Quartz (Mushroom Carving)
Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Dyed Quartzite
Tumbled Metamorphosed Quartz (SiO2) with artificial pigment
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (appearing in jewelry)
Diamond (pure Carbon, C)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2)
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Gold Nugget
Native Gold (Au)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Tiger's Eye (Gold/Brown variety)
Silicon dioxide (SiO2) with fibrous crocidolite inclusions
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Banded)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Gypsum Wallboard (Drywall)
Hydrous calcium sulfate (CaSO4·2H2O)
sedimentary (processed mineral product)
Peridot
Olivine ((Mg,Fe)2SiO4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral