Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Smoky Quartz
Quartz (SiO₂)
Mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Blue Apatite
Calcium Fluorophosphate - Ca5(PO4)3F
mineral
Quartz Geode Fragment with Iron Staining
Silicon Dioxide (SiO2)
mineral
Sphalerite in Matrix (Polished Point)
Zinc sulfide (Zn,Fe)S
mineral
Gold Ore in Quartz
Auriferous Quartz (Gold: Au; Quartz: SiO2)
Mineral
Tiger's Eye (Polished Point/Tower)
SiO2 (Silicon Dioxide) with included crocidolite fibers
Mineral (Metamorphic pseudomorph)
Granite
Granite
igneous
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Yellow Quartz (Polished)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Black Tourmaline (Schorl)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
Tiger's Eye
Quartz (SiO2) with fibrous inclusions of Altered Crocidolite
mineral
Amazonite
K(AlSi3O8) - Potassium Feldspar (Microcline variant)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Mineral
Biotite / Black Mica
Biotite K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Star Sapphire
Corundum (Al2O3) with Rutile inclusions
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Rhodonite in Quartz Matrix
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Gold Nugget
Native Gold (Au)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide) - SiO2 with Iron Oxide inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
mineral
Snowflake Obsidian
Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)
igneous
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral