Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Category
Not A Rock
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Vesicular Basalt (River Rock)
Afanitic Vesicular Basalt
igneous
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Fossil Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Feldspar-rich Quartzite
Meta-arkose (Quartz-Feldspar Quartzite)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)
mineral
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
sedimentary
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Granite
Granite
Igneous
Dyed Agate
SiO2
Mineral
Asphalt Concrete
Bituminous conglomerate
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Quartzite-rich River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
River Stone (River Rock)
Smooth Clastic Sedimentary Rock
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Porphyritic Andesite/Basalt or Diorite River Rock
Porphyritic Igneous Rock
Igneous
River Rock (Basalt)
Aphanitic Basaltic Rock
igneous
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Dragon Blood Jasper
SiO2
mineral
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral