Sandstone (River Cobble)
Sandstone (composed predominantly of SiO2 - Quartz)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Goldstone and pink quartz bead strands
Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red jasper (iron-rich chalcedony), possibly brecciated
Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides
mineral
Chert (and Jasper) Nodules in Limestone
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Rounded quartz-rich cobble, likely granite-derived stone
Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Blue Goldstone
Man-made glass with suspended copper, cobalt, or manganese particles
man-made glass
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Coquina or Fossiliferous Conglomerate
Bioclastic Rudstone (variable composition)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Herkimer Diamond
Quartz (SiO2)
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Turquoise bead bracelet
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2) on host rock
mineral
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Granite
Intrusive Igneous Rock
igneous
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Rounded gray-brown river pebble
Indeterminate lithic clast; likely weathered sandstone or fine-grained metamorphic rock
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Diamond
Carbon (C)
mineral
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Iron-stained weathered stone (tentative)
Undetermined; possibly weathered iron-rich basalt or concretion
mineral