Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is a cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Moonstone
Adularia (orthoclase feldspar variety)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Schist
Schist (various mineral compositions)
metamorphic
Chert (White Variety)
Silicon Dioxide (SiO2)
sedimentary
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8) with inclusions
mineral
Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milk Quartz (Tumbled Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Jasper
Silicon Dioxide (SiO2)
Mineral/Sedimentary Rock (as a cryptocrystalline variety of quartz)
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Strawberry Quartz
Quartz (SiO₂) with Goethite (α-FeO(OH)) and/or Lepidocrocite (γ-FeO(OH)) inclusions
Mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Pink Granite (Crystalline Granite)
Igneous Intrusive Rock (Felsic Plutonic)
igneous
Chert (Tan/Buff variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Black Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Chert Nodule (Flint)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Amazonite
Amazonite (KAlSi3O8 - a variety of Microcline Feldspar)
Mineral
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal/Tumbled Agate)
Silicon Dioxide (SiO2)
mineral