Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
Green Slate (Greenstone)
Metamorphic shale (varied composition)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Mineral
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Cubic Carbon (C)
mineral
Jasper with Quartz inclusion
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral
Fossilized Shark Tooth
Scapanorhynchus (Sand Tiger Shark relative)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide) - SiO2
mineral
Carnelian
Carnelian Chalcedony (SiO2)
mineral
Banded Agate (specifically Lake Superior Agate or similar)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Nodule)
Microcrystalline Silica (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Chert (vuggy variety)
Microcrystalline silica (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (C)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Pebbles
Quartz (Silicon Dioxide, SiO2)
Mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red Sandstone
Arenite with Hematite (Fe2O3) cement
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral