Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Sedimentary Or Igneous (Secondary Formation)
Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.
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Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Native Copper
Copper (Cu)
mineral
Smoky Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Greenstone
Metabasalt / Greenschist
metamorphic
Obsidian
Obsidian
Igneous
Bivalve Seashell Fossil
Class Bivalvia
fossil
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Weathered quartz-bearing rock fragment
Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded Agate (Pink Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock
igneous
Feldspar (with Quartz / Iron Staining)
Potassium Feldspar / Plagioclase (KAlSi3O8 - NaAlSi3O8 to CaAl2Si2O8)
mineral
Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
gemstone
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
K2 Jasper
Azurite in Granite
igneous
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral