Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartzite Beach Pebble
Quartzite (primarily SiO2)
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
Greywacke (River Slikenside)
Greywacke (Lithic Sandstone)
Zebra Jasper
Silicon dioxide (SiO2) with various impurities
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
Marble
Recrystallized Carbonate Rock (CaCO3)
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Yellow Quartz (Iron-stained Quartz)
Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
Quartzite
Quartzite (SiO2)
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Quartz (Milky or Smoky)
Silicon Dioxide (SiO2)
Jasper (Red Chert)
Jasper (Silicon Dioxide, SiO2)
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
Amethyst Quartz (Tumbled)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
Gneiss (specifically Pink Gneiss)
Gneiss (high-grade regional metamorphic rock)
Yellow Calcite
Calcium Carbonate (CaCO3)
River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
Red Jasper
Jasper (Silicon Dioxide with iron oxide inclusions), SiO2
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
Ironstone (likely Ferruginous Siltstone/Sandstone)
Ferruginous sedimentary rock (FeOx-rich clastic)
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
Jasper (Iron-rich Microcrystalline Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Marble
Metamorphosed Limestone (calcite formulation CaCO3)
Jasper
Jasper (SiO2 plus impurities)
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)