Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Category
Not A Geological Specimen
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Quartz
Silicon Dioxide (SiO2)
mineral
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Polymictic conglomerate
Lithified polymictic conglomerate; clasts likely quartzite, granite, and volcanic rock in a dark matrix
sedimentary
Chalcedony with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Not a rock
Not a rock
Not a rock
Garnet Schist
Almandine-Mica Schist
metamorphic
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
River Pebbles (White Quartz and Basalt mix)
Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)
sedimentary
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially granitic or quartzitic material
igneous
Siltstone Concretion
Carbonate-cemented Siltstone Concretion
sedimentary
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
River Cobble (Quartzite / Sandstone Gravel)
SiO2 (Quartz-rich sedimentary/metamorphic rock)
sedimentary
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veins in metamorphic/igneous host rock
igneous
Agate (specifically Waterline or Onyx-type Agate)
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Fossil coral, likely solitary rugose coral
Rugosa (possibly colonial tabulate coral); calcite/aragonite replaced by calcite
fossil
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Granite with Tourmaline or Biotite
Phaneritic Igneous Rock (Granoid)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Omarolluk
Omarolluk (Siliceous greywacke with hemispherical voids)
sedimentary
Greenish altered rock, possibly serpentinite or chlorite-rich schist
Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage
metamorphic
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Glendonite (Calcite Pseudomorph after Ikaite)
Calcite (CaCO3) pseudomorph after Ikaite (CaCO3·6H2O)
mineral