Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Category
Not A Geological Specimen
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Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Yellow Quartz (Polished)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (with goethite)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Moqui Marble (Ironstone Concretion)
Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Biotite Schist with Garnet
Garnet-Biotite Schist
metamorphic
Amazonite
Microcline (KAlSi3O8)
mineral
Quartz Geode
Silicon Dioxide (SiO₂)
mineral
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
mineral
Quartz nodule (River pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained or Milky)
Silicon Dioxide (SiO2)
mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold
Native Gold (Au)
mineral
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
River Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Banded Onyx (Calcite Marble)
Calcite (CaCO3) - Trap-rock or Cave Onyx
sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone with Rugose Coral
Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)
sedimentary
Gold Ore
Native Gold in Quartz (Au)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral