Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Category
Non Geological
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Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
River Cobble (Basalt / Gabbro)
Mafic Igneous Rock (Basaltic / Gabbroic Composition)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal (specifically a milky or semi-translucent single crystal point)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz (Peach / Hematoid Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Crinoid Fossil Fragment
Crinoid stem fossil (Echinodermata)
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Waterworn Pebble / Quartzite
Metamorphic/Sedimentary rock fragment
sedimentary
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
fossil
Jasper
Microcrystalline quartz (SiO2) with impurities
sedimentary
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Brachiopod or Bivalve Fossil in Limestone
Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)
fossil
Agate Geode with Quartz
Silicon Dioxide (SiO2)
mineral
Granite River Pebble
Granite (Phaneritic Igneous Rock)
igneous
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
River Cobble (likely Metasedimentary or Basalt)
Metamorphosed Siltstone or Altered Fine-grained Igneous Rock
metamorphic
Calamites Fossill (Lepidodendrales)
Calamites sp. (Family Calamitaceae)
sedimentary
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Fossilized Brain Coral
Diploria labyrinthiformis (Fossilized)
sedimentary
Gastropod Fossil (Snail Internal Cast)
Class Gastropoda (Steinkern)
sedimentary
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Glacial Cobbles (predominantly Granite and Gneiss)
Mixed lithologies (Quartz, Feldspar, Mica assemblage)
igneous and metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Calamites Fossil (Horsetail Stem)
Calamites (Genus), part of the class Equisetopsida
sedimentary
Quartz Sandstone
Quartz Arenite
sedimentary
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic