Citrine
Silicon Dioxide (SiO2)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Green Onyx (Banded Calcite)
Banded Calcite / Aragonite (CaCO3)
mineral
Blue Onyx (Dyed Agate/Chalky Chalcedony)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Cream River Jasper
Silicified microcrystalline quartz (SiO2)
sedimentary
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Black Agate
Chalcedony (SiO2)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green Quartzite
Quartzite (SiO2 with chromium-rich impurities)
metamorphic
Amethyst-bearing quartz (rough/tumbled fragment)
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Milky quartz
Quartz (SiO₂), commonly massive or vein quartz
mineral
Raw green aventurine (likely quartzite)
Quartz-rich quartzite, chiefly microcrystalline SiO₂ with green mica/fuchsite or chlorite
metamorphic
Tumbled quartz pebble
Quartz (SiO₂), likely milky or fractured rock crystal
mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Polished red jasper beads
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Diabase (Trap Rock)
Diabase (also known as Dolerite)
igneous
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Granodiorite
Granodiorite
igneous
Gold Flakes in Oil (Novelty Specimen)
Native Gold (Au)
mineral
Dyed Tumbled Quartz
Silicon Dioxide (SiO2) with artificial pigment
mineral
Silicon
Element Si
mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Scoria
Vesicular Basalt / Scoriaceous Basalt
igneous
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Rock)
Igneous
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Porphyritic Andesite
Andesite (Porphyry)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Host rock) with Quartz or Calcite amygdules
igneous
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Basalt with Quartz/Calcite Vein
Basalt (Mafic Volcanic Rock with secondary mineralization)
igneous
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary