Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Rough Diamond
Diamond (pure Carbon, C)
mineral
Polished blue sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed chalcedony or lapis lazuli
mineral
Rounded gray pebble, likely quartz-rich stone
Indeterminate; possibly quartzite or a weathered granitic pebble
rock
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Likely sodalite (rough blue specimen)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Tumbled kiwi jasper (often sold as sesame jasper)
Trade name for a green, quartz-rich rock, commonly a mixture of quartz/chalcedony and dark mineral inclusions; not a single defined mineral species
metamorphic
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Rounded gray pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly plagioclase with pyroxene and/or olivine
igneous
Schist
Mica Schist
metamorphic
Small weathered fossil or mineral fragment
Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral
fossil
Polished peridot (olivine) cabochon
Olivine, typically forsterite-rich: (Mg,Fe)₂SiO₄
gemstone
Native Copper Bearing Basalt
Cu
igneous
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Schist
Chlorite or Mica Schist
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Iron-stained chalcedony or jasper
Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Unidentified rock fragments
Indeterminate; likely a weathered, iron-stained silicate rock
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
Quartzite
SiO2 (Metamorphosed Sandstone)
metamorphic
Likely sandstone or weathered quartz-rich rock fragment
Quartz-rich sandstone; exact identification is uncertain from the photograph
sedimentary
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Diamond (in Matrix)
Carbon (C)
mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Clear faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); visual identification is uncertain and diamond or another colorless stone is possible.
gemstone
Sandstone
Arenite
sedimentary
Quartz vein in host rock
Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist
metamorphic