Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
Mixed Gemstone Beaded Jewelry
Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)
Mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
N/A - Non-Geological Item
not a rock/mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Blue Quartzite
Quartzite (silicon dioxide, SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Silver (Native Element)
Ag (Native Silver), with minor Copper (Cu)
mineral
Beryl (Variety: Aquamarine/Green Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Gold Nugget Jewelry
Native Gold (Au)
mineral
Chert (and Jasper/Chalcedony mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limonite
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
mineral
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Porphyry (Flower Stone)
Porphyritic Basalt or Andesite
igneous
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
mineral
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Hag Stone
Perforated Sedimentary Rock
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Copper Nugget
Native Copper (Cu)
mineral
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary