Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Quartz (Clear or Milky)
Silicon Dioxide (SiO2)
Rounded sandstone pebble
Quartz-rich sandstone; commonly arkose or lithic sandstone
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Pyrite
Iron Sulfide (FeS2)
Sandstone
Clastic Sedimentary Rock
Sandstone (Banded)
Sedimentary Clastic Rock
Sandstone
Clastic Sedimentary Rock
Sandstone
Clastic sedimentary rock
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Chert (potentially Flint or Mudstone)
Microcrystalline Quartz (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
Green Quartz (Prasiolite / Chlorite-Included Quartz Pebble)
Silicon Dioxide (SiO2) with micro-inclusions
Chalcedony / Agate Pebble
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
Quartz Geode
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
Quartz (Tumbled Peach/Pink Quartz)
Silicon Dioxide (SiO2)
Chert / Flint
Microcrystalline quartz (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
Chalcedony Nodule / Agate
Silicon Dioxide (SiO2)
Quartz Crystal
Silicon Dioxide (SiO2)
Quartz Mineral
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
Ferruginous Sandstone with Quartz Inclusions
Clastic Sedimentary Rock (Iron-rich Sandstone)
Clear Quartz
Silicon Dioxide (SiO2)