Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Man Made Material (Metal)
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Quartzite Pebbles
Metamorphosed sandstone (SiO2)
metamorphic
Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Quartzite
Quartzite (mostly SiO2)
metamorphic
Yellow Beryl (Heliodor)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Beryl (likely var. Aquamarine or Goshenite) in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Gossan (Iron Cap)
Limonitic Gossan (Fe2O3·nH2O mixed)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Gold Nugget
Native Gold (Au)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of Titanium, Manganese, or Iron
mineral
Manganese Nodule
Polymetallic Nodule (Hydrous manganese and iron oxides)
mineral
Gossan / Iron Ore Rock
Hematite / Goethite / Limonite iron oxide assemblage
mineral
Eudialyte
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral/igneous
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Aura Quartz (Titanium or Angel Aura coated)
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral理论上属于沉积成因
Weathered iron-rich sandstone or ironstone
Ferruginous sandstone, likely limonite/goethite-cemented quartz arenite
sedimentary
Native Copper
Native Copper (Cu)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Native Copper
Native Copper (Cu)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral