Sandstone
Clastic Sedimentary Rock
sedimentary
Category
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Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Pink Himalayan Salt Rock
Halite (NaCl with trace iron oxide minerals)
mineral
Garnet in Schist (Mica Schist with Garnet Inclusion)
Garnetiferous Mica Schist (X3Al2(SiO4)3)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Sandstone
Arenite
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Sandstone (with Chert/Quartzite nodules)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
River Pebble
Weathered Rock Fragment
sedimentary
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Starfish Fossil
Asteroidea fossil
fossil
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Serpentine
Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline/Gravel)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium traces)
gemstone
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Porphyritic Basalt or Porphyry
Porphyritic Igneous Rock
igneous
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Sandstone / Chert Pebble
Silicon Dioxide / Sedimentary Rock (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Milky Quartz (with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4) rosette
mineral
Granite
Intrusive igneous rock
igneous