Siltstone Pebble with Veining
Siltstone
sedimentary
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Granite
Plutonic felsic igneous rock
igneous
Lepidolite in Quartz (or Lepidolite Ore)
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Quartz (SiO2)
igneous
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Fuchsite
Chrome-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Blue Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Muscovite (White Mica)
Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2
Mineral
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Dendritic Opal (Merlinite)
Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Blue Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Fuchsite
Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Dalmation Jasper
Perthitic Feldspar with Arfvedsonite inclusions
igneous
River Pebble (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) mixture with varied clastic minerals
sedimentary/metamorphic
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
igneous
Granite
Granitoid (comprised of Quartz, Feldspar, and Mica)
igneous
Chert (Limestone-based)
Silicon dioxide (SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Weathered porphyritic volcanic rock
Likely porphyritic andesite or basalt; exact identification requires a fresh surface and testing
igneous
Fossil Shark Tooth
Elasmobranchii (Class) fossil - possibly Odontaspididae family
fossil
Sunstone
Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8
mineral
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Epidote in Quartz
SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)
mineral
Gneiss
Gneiss
metamorphic
Basalt with Peridotite Xenolith
Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Lepidolite Polished Point
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
igneous
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Greenschist
Chlorite schist
metamorphic