Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O))
mineral
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Schorl (Black Tourmaline) in Quartz/Feldspar Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Rubellite Tourmaline
Elbaite Tourmaline, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
gemstone
Raw Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Common Quartz Pebble
Silicon dioxide (SiO2) rock fragment
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Fossiliferous Limestone
Calcite-rich Fossiliferous Limestone (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Red Jasper (Brecchiated Jasper)
Silicon Dioxide (SiO2) with Hematite impurities
Sedimentary / Mineral
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert / Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate
Sedimentary
Quartzite
Quartzite (Metamorphic rock primarily composed of SiO2)
metamorphic
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine alternative)
Silicon Dioxide (SiO2) with iron impurities
mineral
Dyed Agate
Chalcedony (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral