Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Category
Synthetic (Not A Rock Or Mineral)
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Granite
Intrusive igneous rock
igneous
Garnet in Schist (Mica Schist with Garnet Inclusion)
Garnetiferous Mica Schist (X3Al2(SiO4)3)
metamorphic
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite Geode (Ironstone Concretion)
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Pink Himalayan Salt Rock
Halite (NaCl with trace iron oxide minerals)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
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
Greenschist
Greenschist facies rock
Metamorphic
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Basalt
Aphanitic Mafic Igneous Rock
igneous
River Pebble (Sandstone)
Quartz-rich Sandstone Pebble
sedimentary
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
Felsic intrusive igneous rock
igneous
Granite
Plutonic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Weathered granitic rock (tentative)
Granite, composed mainly of quartz, feldspar, and mica
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
Unakite
Unakite (altered granitic rock)
metamorphic
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Tumbled banded metamorphic stone
Likely banded gneiss or migmatitic gneiss; exact identification requires testing
metamorphic
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe2O3 staining)
metamorphic