Glauconitic Sandstone
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 in Quartz Sandstone
sedimentary
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
Learn about Organic Mineraloid And Mineral in the encyclopedia
View all →
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Quartzite river stone
Quartzite (SiO2)
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Amber (Raw Copal)
Fossilized Plant Resin (Gummite/Succinite)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)
mineral
Amber
Succinite (fossilized tree resin)
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O)
mineral
Moss Agate with Quartz Druzy
Chalcedony with inclusions (SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
mineral
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow / Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2)
gemstone
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Jasper Mushroom Carving
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Agate (Sliced and Carved)
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Agate Nodules
Cryptocrystalline Quartz (SiO2)
mineral
Amethyst on Agate
Crystalline Quartz (SiO2) with trace Iron (Fe3+)
mineral
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Amber
Fossilized Tree Resin (Organic Polymer)
gemstone
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. (likely Lemon or Sand Tiger)
sedimentary
River Cobble (Sandstone)
Arenite (primarily SiO2)
sedimentary
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Amber
Succinite
Organic Mineral
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Banded Chert (Ironstone type)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary