Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
Category
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
Amber Chert (Jasper)
Microcrystalline Quartz (SiO2)
Malachite
Copper(II) carbonate hydroxide, Cu2CO3(OH)2
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
Chert (River Cobble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Basalt with Iron Oxides
Mafic Igneous Rock (Mafite)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Ferruginous Quartz
SiO2 (Silicon Dioxide) with Iron Oxide inclusions (FeO(OH) / Fe2O3)
Concrete Fragment
Hardened Portland Cement Composite
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
Chert (Gravel)
Microcrystalline Quartz (SiO2)
Chert (varieties include Jasper or Flint)
Chert (Microcrystalline Silica, formula: SiO2)
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
Quartz (Sand Grain size)
Silicon Dioxide (SiO2)
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Turquoise in Matrix
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
River Quartz Cobble
Silicon Dioxide (SiO2)
Quartzite with Quartz Vein
Quartzite (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
Gold Nugget
Native Gold (Au)
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
Limonite with Opal infusion
FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
Granite (Weathered)
Phaneritic Felsic Igneous Rock