River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Granite
Granitoid (dominated by Quartz and Feldspar)
igneous
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Red Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Granite
igneous
Limestone
Calcium carbonate (CaCO3)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Quartz with Tourmaline and Iron Staining
Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2) matrix
metamorphic
Greenstone or Epidote-rich Metamorphic Rock
Chlorite/Epidote Schist or Greenstone
metamorphic
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Yellow Aventurine (Yellow Quartz)
Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica
Mineral (variant of Quartz)
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite
igneous
Pink Granite
Phaneritic Acidic Igneous Rock (Rich in K-feldspar)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Aventurine (Green)
Silicon Dioxide (Quartz with inclusions of Fuchsite)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Chert (specifically Yellow/Common Opal or Jasper mixture)
Silicon Dioxide (SiO2)
sedimentary
Chrysoprase
Chalcedony (cryptocrystalline SiO2 variety)
Mineral