Chert (Flint variety)
Chert (SiO2)
sedimentary
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Moonstone (specifically Cat's Eye or Gray Moonstone)
Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8
mineral
Orange Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Jasper Agate
Silicon dioxide (SiO2)
mineral
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Unakite
Epidotized Granite
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
K(AlSi3O8) - Potassium Feldspar (Microcline variant)
mineral
Pallasite Meteorite
Pallasite (Iron-Nickel Matrix with Olivine/Peridot inclusions)
Mineral / Extraterrestrial Rock
Yellow Topaz (Imperial or Precious Topaz)
Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)
mineral
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
metamorphic
Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Orange Calcite (Banded Calcite)
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Raw Citrine (Yellow Quartz)
Citrine / Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Ruby in Zoisite
Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)
metamorphic
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)
mineral
Yellow Quartz (Chalcedony/Agate)
Silicon Dioxide (SiO2)
Mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
mineral
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Green Jasper
Jasper (variety of Microcrystalline Quartz, SiO2)
sedimentary
Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Milky Quartz Mushroom Carving
Quartz (Silicon Dioxide, SiO2)
mineral