Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Yellow Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Unakite
Epidotized Granite
metamorphic
Halite
Sodium Chloride (NaCl)
mineral
Schist
Metamorphic Schist
metamorphic
Pyrite-bearing Rock / Pyrite Ore
Iron Sulfide (FeS2) in host rock matrix
mineral
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Metallic iron meteorite fragments (probable)
Iron meteorite, chiefly kamacite (α-(Fe,Ni)) with possible taenite
meteorite
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Quartz Vein in Basalt
Silicon Dioxide (SiO2) in Mafic Igneous Rock
igneous
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Red Scoria
Scoria (Vesicular Basalt/Andesite)
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Shale
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
River Pebble (Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Basalt
Basalt (Aphanitic-fine grained mafic igneous rock)
igneous
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Unknown Rock Specimen
igneous
Rough Diamond (Bort)
Diamond (C)
mineral
Rough Diamond
Diamond (C)
mineral
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
Sedimentary
Andesite Porphyry
Andesite Porphyry
Igneous
Polished banded jasper pebble
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral impurities
mineral
Fossil crinoid stem segment (columnal)
Crinoidea; commonly preserved as calcite ossicles, often called entrocrinite
fossil
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Tumbled brown agate
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
mineral
Orbicular jasper (orbicular chert), likely ocean jasper
Silicified microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and/or clay-rich orbicules
sedimentary
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Rose quartz heart
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Tumbled rose quartz
Quartz (SiO₂), pink variety
mineral