Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Category
Man Made Object (Coin)
Browse man made object (coin) specimens identified by the Rock Identifier community.
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Chert (Jasper/River Stone)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Dolomite
Dolomite (CaMg(CO3)2)
Mineral
Milky Quartz
Quartz (SiO2)
Mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
mineral
Black Chert
Chert (microcrystalline quartz)
Mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Kyanite
Kyanite (Al2SiO5)
Mineral
Rutilated Quartz
SiO2 with TiO2 inclusions
Mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Basalt with Vesicles
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral