Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
sedimentary
Category
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Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Yellow Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Agate (Beads)
Silicon Dioxide (SiO2)
mineral
Moonstone (Feldspar)
Orthoclase/Albite ((K,Na)AlSi3O8)
mineral
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Banded Agate
Microcrystalline Quartz (SiO2) with impurities
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sulfur
Sulfur (S8)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Blue Sapphire (Ceylon)
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chrysanthemum Stone
Celestine (SrSO4) or Calcite (CaCO3) in Limestone/Porphyry matrix
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Mineral
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Beryl (Emerald or Aquamarine in Matrix)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Shell Cameo
Cypraecassis rufa (Bullmouth Queen Helmet Shell)
mineraloid / biogenic specimen
Clear Quartz (Crystal Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fluorite (Rainbow, Purple-Blue Tumbled)
Calcium Fluoride (CaF2)
Mineral
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Citrine
Quartz (SiO₂)
Mineral
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Carnelian Agate
Silicon Dioxide with Iron Oxide impurities (SiO2)
mineral
River Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone