Banded Sandstone
Arenite with Liesegang banding
sedimentary
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with impurities)
sedimentary
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Pink Granite
Phaneritic Quartz-Feldspar Granite
igneous
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite (Plagioclase Feldspar + Amphibole/Biotite)
igneous
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Thunderegg (Agetized Geode nodule)
Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Limestone (Grey and White specimens)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (composed of microscopic silt-sized particles of quartz and feldspar)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Bivalve Fossil (Clam/Mollusk)
Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Quartzite (River Cobble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amber
Succinite (C10H16O)
mineraloid
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Snakeskin Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
River Stone (River Pebbles)
Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material