Basalt Pebble
Extrusive igneous rock
igneous
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Basalt Pebble
Extrusive Igneous Rock
igneous
Mica-rich rock, likely mica schist
Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Small weathered pebble, possibly limestone
Indeterminate carbonate-rich rock; likely calcite-bearing limestone
sedimentary
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Dalmatian Stone
Dalmatian Jasper / Feldspathic Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartzite with Iron Staining
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Porphyritic Basalt
Porphyritic Basalt (Mafic Volcanic Rock)
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Muscovite Mica in Quartz
Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)
metamorphic
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Gabbro or Diorite with Felsic intrusion
Mafic to intermediate intrusive igneous rock with felsic vein/inclusion
igneous
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite Cobble
Quartzite (SiO2 based metamorphic rock)
metamorphic
Chert (Arrowhead/Projectile Point)
Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered basalt
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Agate Geode (with Microcrystalline Quartz)
Silicon Dioxide (SiO2) - variety Chalcedony/Agate
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic