Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
Mineral
Obsidian (specifically Silver Sheen Obsidian)
Volcanic Glass (approx. 70–75% SiO2 plus MgO, Fe3O4)
igneous
Gold Nugget
Native Gold (Au)
mineral
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granitoid
igneous
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Mineral equivalent / Metal Alloy
Chondrite Meteorite
Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)
Mineral
Chert (and/or Siltstone River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Chalcedony or Flint variation)
Microcrystalline Quartz (SiO2)
sedimentary
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Rough Diamond
Diamond (Native Element Carbon, C)
mineral
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Slate with Quartz
Low-grade Metamorphic Slate with SiO2 inclusions
metamorphic
Ametrine
Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)
mineral
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Golden Sheen Obsidian
Obsidian (volcanic glass) with inclusions of gas bubbles and mineral crystals (e.g., hematite, magnetite) causing the sheen
igneous
Feldspar-rich Quartzite
Feldspathic Quartzite (Metamorphosed Sandstone)
Metamorphic
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Green Quartz / Aventurine
Silicon Dioxide (SiO2) with inclusions
Metamorphic
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Native Gold
Gold (Au)
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Indian Agate
Cryptocrystalline Quartz (SiO2)
mineral
Biological Specimen (Domestic Dog)
Canis lupus familiaris
Organic (Non-rock)
Tourmalinated Quartz
Quartz (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) inclusions
mineral
Raw Corundum (Sapphire/Ruby variant)
Aluminum oxide (Al2O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Pink Anthracite Coal (dyed)
Anthracite Coal (Artificially Colored)
Sedimentary Rock (Altered)