Vesicular basalt (likely weathered scoria)
Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles
igneous
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Weathered reddish-brown rock fragment
Probably altered basalt or fine-grained volcanic rock; exact identification requires testing
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone / Chert Pebble
Silicon Dioxide / Sedimentary Rock (SiO2)
sedimentary
Citrine
SiO2 (Silicon Dioxide)
Mineral
Basalt
Mafic Igneous Rock
igneous
Orange Crackle Quartz
Silicon Dioxide (SiO2) with thermal fracturing
mineral
Dyed Tumbled Quartz
Silicon Dioxide (SiO2) with artificial pigment
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Iron-stained sandstone or weathered ironstone concretion
Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Blue Topaz
Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2
gemstone
Diamond
Natural Carbon (C)
mineral
Basalt Arrowhead (worked stone)
Aphanitic mafic volcanic rock (Basalt)
igneous
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Tumbled quartz-rich agate/geode fragment
Microcrystalline quartz (SiO₂), likely chalcedony with crystalline quartz and possible iron-oxide inclusions
mineral
Granite
Phaneritic plutonic igneous rock (typically 20% to 60% quartz by volume)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite
Quartz (SiO₂), potentially with feldspar and iron-oxide staining
mineral
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Dark coarse-grained rock, likely basalt or gabbro
Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene
igneous
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Tektite (Indochinite)
Tektite (High-silica natural glass, primarily SiO2 with Al2O3)
igneous
Black obsidian (probable)
Volcanic glass; primarily SiO₂-rich rhyolitic composition
igneous
Granite Cobble
Granite
igneous
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite or Limonite staining
mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Chert (Agatized)
Silicon Dioxide (SiO2)
sedimentary
Polished red jasper
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
mineral