Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
sedimentary
Category
Man Made Material (Simulated Mineral)
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Limestone with Iron Inclusions
Calcium Carbonate (CaCO3) with Hematite/Limonite
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Iron-rich quartzite or weathered ironstone
Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite
metamorphic
Vesicular Basalt / Scoria (Stream-rounded Cobble)
Mafic extrusive igneous rock
igneous
Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled smoky quartz
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Gemstone Ring
Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)
gemstone
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
sedimentary
Milky Quartz (with potential inclusion)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Granite
Phaneritic Plutonic Felsic Rock (SiO2 > 69%)
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Weathered quartz-rich granitoid (likely granite or granodiorite)
Granite–granodiorite; chiefly quartz (SiO₂), feldspar, and minor mica/amphibole
igneous
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Amygdaloidal Basalt with Quartz
Basalt with Secondary Mineral Infilling
igneous
Polished mahogany obsidian (likely)
Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides
igneous
Yellow Quartzite (Citrine-colored Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified wood (SiO2)
fossil
Tumbled milky quartz (likely chalcedony or quartzite)
Quartz/chalcedony, silicon dioxide (SiO₂)
mineral
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Drupa Quartz (Sparkly Drusy Quartz on Matrix)
Crystalline Silicon Dioxide (SiO2) on host rock
mineral
Weathered chert or silicified limestone nodule
Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing
sedimentary
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous