Greenstone / Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Category
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Basalt (River Pebble)
Mafic volcanic rock (rich in magnesium and iron)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Snakeskin Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Vesicular Basalt (Scoria)
Basalt (Vesicular texture)
igneous
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Serpentinite
Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
River Stone (Basalt or Siltstone)
Mafic Volcanic Rock or Clastic Sedimentary Rock
igneous or sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate rock
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Botryoidal chalcedony (possibly agate/geode material)
Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining
mineral
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Porphyritic Basalt
Basalt (with plagioclase phenocrysts)
igneous
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Igneous or Sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Gneiss
Gneiss
metamorphic
Horn Coral Fossil
Rugosa (Tetracoralla)
fossil
Granite
Intrusive Igneous Rock
igneous
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary