Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO₂)
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2 with Hematite impurities)
Mineral
Puddingstone
Conglomerate
Sedimentary
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert / Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Opal/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2) with iron oxide impurities
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO₂)
Mineral
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon dioxide (SiO2) - variety of Chalcedony
mineral
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Epidote in Quartz
Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)
Mineral
Wonderstone
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Chert (Flint variety)
Microcrystalline Silica (SiO2)
sedimentary
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral