Heulandite with Stilbite
Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Category
Sedimentary (Secondary Formation)
Browse sedimentary (secondary formation) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Turquoise (beads)
Turquoise; CuAl6(PO4)4(OH)8·4H2O
Mineral
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Native Copper (in coinage alloy)
Copper (Cu)
mineral
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral
Black Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Native Gold Nugget
Native Gold (Au)
mineral
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Turquoise and Hematite
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3
mineral
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
Dioptase
Dioptase (CuSiO3 · H2O)
mineral
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Jasper pebble
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary (secondary classification: cryptocrystalline quartz)
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz with Epidote or Chlorite inclusions
Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Turquoise (Tumbled/Polished)
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral