Polished pink halite (Himalayan salt)
Halite (sodium chloride, NaCl)
mineral
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
Learn about Industrial By Product in the encyclopedia
View all →
Mixed river stones and gravel
Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
igneous, sedimentary, metamorphic
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Hematite
Hematite (Fe2O3)
mineral
Botryoidal Hematite (Iron Stone Conglomerate)
Hematite (Fe2O3) in sedimentary matrix
sedimentary
Weathered feldspar-rich granite or granitic pegmatite
Altered granite/pegmatite, composed mainly of quartz (SiO₂), alkali feldspar, plagioclase, and dark mica or amphibole
igneous
Pumice
Pumice (Volcanic Glass with Vesicular Texture)
igneous
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and attached host material
mineral
Scoria
Vesicular Mafic Extrusive Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Chert (specifically Flint or Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amethyst (Tumbled)
Amethyst (SiO2 with iron impurities)
mineral
Weathered porphyritic volcanic rock (likely andesite or basalt)
Fine-grained intermediate-to-mafic volcanic rock; likely andesite/basalt composed mainly of plagioclase, pyroxene, and possibly altered iron-bearing minerals
igneous
Grey Chalcedony (Tumbled)
Chalcedony (SiO2)
mineral
Limonite / Goethite Ironstone Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Tumbled white quartz pebble
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Milky quartz with iron-oxide staining
Quartz, silicon dioxide (SiO₂), likely massive milky quartz
mineral
Flint
SiO2 (Microcrystalline quartz / Chert)
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert
Chert (SiO2, Silicon Dioxide)
sedimentary
Pumice
Highly vesicular volcanic glass (unnamed scientific variant: Rhyolitic/Andesitic Pumice)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Pumice
Vesicular volcanic glass
igneous
Red Jasper
Jasper (Silicon Dioxide with iron oxide inclusions), SiO2
mineral
Limonite (Ironstone) Concretion
FeO(OH)·nH2O (Hydrous ferric oxide)
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Weathered basalt (possibly iron-stained volcanic rock)
Basalt; predominantly plagioclase, pyroxene, and possibly olivine, with iron-oxide staining
igneous