Green Fuchsite in Quartz (sometimes called Green Aventurine)
Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2
metamorphic
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Chalcedony (specifically Agate or Moonstone-like Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Carnelian (Red Agate/Chalcedony)
Cryptocrystalline Quartz (SiO2) with Hematite impurities
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Vesicular Basalt (Iron-Stained)
Mafic Volcanic Rock (Basalt)
igneous
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Fluorite (Rainbow or Multi-colored Fluorite)
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt
Basalt
igneous
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
Mineral
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
River Cobble (Quartzite and Iron-stained Quartz)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Basalt with Olivine Phenocrysts
Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)
Igneous
Yellow Sapphire or Citrine
Al2O3 (Corundum) or SiO2 (Quartz)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Yellow Quartzite (River Stone)
Quartzite (primarily SiO2)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt with Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous