Amethyst with Marcasite accents
Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Amethyst with Marcasite accents
Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
Quartz Pebble
Silicon Dioxide (SiO2)
Feldspar
Potassium Feldspar (KAlSi3O8)
Pyrite
Iron Sulfide (FeS2)
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
Chalcedony (Agate/Jasper mix)
Cryptocrystalline Sillimanite (Quartz) - SiO2
Milky Quartz
Silicon Dioxide (SiO2)
River Stone (River Pebble)
River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
Citrine Quartz
Silicon Dioxide (SiO2)
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)
Moonstone (Green Moonstone / Garnierite)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite
Citrine (Heat-treated or Natural Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
Moonstone (Feldspar)
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
Glacial Granite with Epidote
Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
Sandstone
Arenite (SiO2 based)
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
Sandstone
Arenite (primarily SiO2)
Sandstone Pebble
Arenite (primarily SiO2)
Chert (Jasper)
Silicon Dioxide (SiO2)
Sandstone
Arenite
Hematite
Iron(III) oxide (Fe2O3)
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
Banded Chert
Silicon Dioxide (SiO2)
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
Dalmatian Jasper (or Dalmatian Stone)
Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)
Pyrite
Iron Sulfide (FeS2)
Banded Gneiss
Gneiss (Metamorphic Rock)
Quartz (Iron-stained or Milky)
Silicon Dioxide (SiO2)
Quartz Drusy (on Geode Fragment)
Crystalline Silicon Dioxide (SiO2)
Banded Gneiss
Gneiss