Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix
metamorphic
Limestone
Sedimentary rock composed primarily of Calcite (CaCO3)
sedimentary
Pegmatite (Graphic Granite / Granite Pegmatite)
Coarse-grained intrusive igneous rock (Felsic)
igneous
Mica Schist
Metamorphic rock dominated by muscovite and/or biotite mica
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Vesicular Basalt (Scoria)
Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)
Igneous
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Blue Sapphire (Raw)
Corundum (Al2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Likely metallic meteorite fragment
Unclassified iron-rich meteorite; possible stony-iron or iron meteorite
meteorite
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Quartzite
Quartzite (primarily SiO2)
metamorphic
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Schist
Schist (Crystalline Metamorphic Rock)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Weathered quartz-rich pebble
Mostly microcrystalline quartz (SiO₂), possibly quartzite or chalcedony with iron-oxide staining
mineral
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Tumbled quartz with iron-oxide staining
Quartz (SiO₂), locally stained by goethite/limonite
mineral
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Rounded river cobble, likely weathered sandstone or quartz-rich metasandstone
Indeterminate sandstone; commonly quartz (SiO₂) with feldspar, lithic grains, and iron-oxide cement
sedimentary
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Agate
Agate (Microcrystalline Quartz, SiO2)
mineral
Yellow Quartzite
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Porphyritic Basalt (or Porphyry)
Porphyritic Basalt (Mafic volcanic rock with phenocrysts)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Serpentinite
Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)
metamorphic