Polished botryoidal jasper/chalcedony (likely ocean jasper)
Microcrystalline quartz, SiO₂, with iron-oxide and other mineral inclusions
mineral
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Tumbled jasper (possibly orbicular jasper)
Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony
mineral
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Unidentified brown mineral/rock fragment
Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Tiffany Stone
Fluoritized Opal Beryllium Tuff (composed of Fluorite; CaF2, Opalized SiO2, Bertrandite, Chalcedony, and Quartz)
metamorphic
Vesicular basalt (scoriaceous basalt)
Basalt, chiefly plagioclase feldspar and pyroxene with minor olivine; vesicles formed by trapped volcanic gas
igneous
Diamond
Carbon (C)
gemstone
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Rounded gray river cobble, likely quartz-rich sandstone or weathered granite
Indeterminate; possible granitic or feldspathic cobble (quartz–feldspar–mica aggregate)
igneous
Schist
Mica Schist
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Likely metallic meteorite fragment
Undetermined iron or stony-iron meteorite; mineralogy requires testing
meteorite
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Rounded dark pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase, pyroxene, ± olivine)
igneous
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Polished brecciated jasper (likely)
Brecciated jasper, an opaque microcrystalline quartz (SiO₂) with contrasting silica-rich fragments and matrix
mineral
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Sandstone
Arenite
sedimentary
Schist
Mica Schist
metamorphic
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Laterite
Laterite (Iron and aluminum-rich residual rock)
sedimentary
Black Kyanite
Aluminum Silicate (Al2SiO5)
mineral
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Fossil oyster shell
Fossilized bivalve, likely Ostrea or a related oyster genus; calcite (CaCO₃) shell
fossil
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with Vesicular Texture)
igneous
Pumice
Pumicite / Vesicular Rhyolite
igneous
Vesicular Basalt
Aphanitic Mafic Volcanic Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Likely polished labradorite (small tumbled stone)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Probable fossil-bearing rock or mineral concretion
Unidentified carbonate-rich concretion with a possible fossil inclusion
fossil