Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Basalt Pebble
Extrusive Igneous Rock
igneous
Porphyritic Basalt
Basalt with Feldspar Phenocrysts
igneous
Graphite
Graphite (Carbon, C)
mineral
Biotite Mica in Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)
mineral
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
mineral
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled red/purple quartz, possibly garnet
Likely quartz (SiO₂), potentially amethyst or iron-stained quartz; identification is uncertain from the blurry image
mineral
Brecciated stone pebble
Breccia
sedimentary
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Quartzite Pebble (with Quartz Vein)
Meta-quartzite (SiO2-dominated metamorphic rock)
metamorphic
Amethyst (Tumbled)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Sunstone with Black Tourmaline (Arfvedsonite)
Feldspar (Na,Ca)(Al,Si)4O8 with Schorl Na(Fe3+)3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Basalt
Extrusive Igneous Rock
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mica (Biotite or Phlogopite Buchsam)
Silicate Mineral (Phyllosilicate family)
mineral
Milky Quartz Pebble with Matrix
Quartz (SiO2)
mineral
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Biotite-rich schist (mica schist)
Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂), with possible quartz and feldspar
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock (Acidic)
igneous
Porphyritic Basalt
Basalt (porphyritic texture)
igneous
Basalt with Epidote (Porphyritic Basalt)
Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions
igneous
Porphyritic Andesite
Andesite with Hornblende phenocrysts
igneous
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Mixed polished river pebbles, predominantly quartzite and quartz
Quartzite (SiO₂), quartz (SiO₂), with possible feldspar-rich and iron-stained lithologies
metamorphic
Mica
Muscovite / Biotite (Phyllosilicate group)
mineral
Granodiorite
Phaneritic intrusive igneous rock
igneous
Muscovite (White Mica)
Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2
Mineral
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Tumbled golden-brown crystal, possibly citrine or quartz
Quartz (SiO₂), tentatively iron-stained or heat-treated citrine
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Basalt with Weathering Crust
Extrusive mafic volcanic rock
igneous