Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
Sedimentary
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Quartz Geode Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Amethyst (Rough)
Quartz, SiO2
mineral
Blue Quartz (specifically Dumortierite Quartz)
Silicon Dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)
metamorphic
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Green Aventurine (or Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Quartz (Iron-stained or Chalcedony varieties)
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Quartz Druzy Geode
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Tumbled jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Porphyritic Amygdaloidal Basalt
Amygdaloidal Porphyritic Basalt (Mafic volcanic rock)
igneous
Amethyst
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Gabbro
Gabbro (mafic intrusive rock)
igneous
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
metamorphic
Chert (with Limonite staining)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Rounded reddish-brown pebble
Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests
sedimentary
Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia
Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides
igneous