Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Category
Not A Rock
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Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
metamorphic
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Agate
SiO2
Mineral
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Yellow Quartz or Citrine Geode/Cluster
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Basalt Porphyry
Porphyritic Basalt
igneous
Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
sedimentary
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Granodiorite
Granodiorite
igneous
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Garnet)
metamorphic
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Shatter Cone (Impactite)
Shock-metamorphosed rock
metamorphic
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Brecciated Jasper or Chert
SiO2
Sedimentary/Metamorphic
Amphibolite
Amphibolite
metamorphic
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Granite with Quartz Vein
Granite
Igneous
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Jasper River Stone
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary