River Cobble (likely Siltstone or Sandstone)
Clastic Sedimentary Rock
sedimentary
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
mineral
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Diorite
Diorite (an intrusive igneous rock)
igneous
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Granitic Pegmatite
Pegmatitic Granite
igneous
River Cobble (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneissic/Schistose)
metamorphic
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Bumblebee Jasper
Anhydrite-Aragonite mixture with Orpiment and Realgar
mineraloid
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss (Metamorphic Cobble)
Gneiss
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Unakite
Epidotized Granite
metamorphic
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Granite
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Banded Gneiss
Gneiss
Metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Epidosite (Epidote-Quartz rock)
Epidote-rich hydrothermal rock
metamorphic
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Limonite with Goethite
Iron Hydroxide Mixture (FeO(OH)·nH2O)
mineral
Quartz (Milk Quartz Cobble)
Silicon Dioxide (SiO2)
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Pink Marble or Rose Quartz (Likely Pink Marble based on carving texture)
Recrystallized Calcite (CaCO3)
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary