Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Category
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Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Feldspathic / Chert Pebble)
Silicon Dioxide (SiO2) / Potassium Feldspar (KAlSi3O8)
sedimentary
Sandstone (River Cobble)
Sandstone (principally composed of Quartz, SiO2)
sedimentary
River-worn Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
Sedimentary
Rounded granitic pebble
Granite, likely biotite granite or granodiorite
igneous
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Granite Cobble
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Basalt (Porphyritic Basalt)
Extrusive Igneous Rock
igneous
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Serpentine
Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)
Metamorphic Rock / Quartzite / Granitic Gneiss
metamorphic
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (SiO2)
metamorphic
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Granite
Granite
Igneous
Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Coarse-grained gray metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss (probable)
metamorphic