Sedimentary (With Some Aspects Of Mineral Replacement)

Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Mineral structure/Rock

Granite Pegmatite with Tourmaline and Muscovite

Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))

igneous

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Mineral

Granitic Pegmatite

Granitic Pegmatite (principally Quartz, Feldspar, and Mica)

igneous

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

mineral

Rose Quartz

SiO2 (Silicon Dioxide)

mineral

Pegmatite (White Granite variant)

Pegmatitic Granite (Quartz and Feldspar rich)

igneous

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Synthetic / Textile

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

igneous

Blue Diamond

Carbon (C) with trace Boron

mineral

Gneiss

High-grade foliated metamorphic rock

metamorphic

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

mineral

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mineral

Synthetic Ruby (Jewel Bearings)

Synthetic Corundum (Al2O3 doped with Chromium)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Anthracite Coal

Anthracite (Carbon based fossil fuel)

metamorphic

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Diamond

Native Carbon (C)

mineral

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sedimentary Rock

Glauconitic Sandstone (Greenstone)

Glauconitic Siliciclastic Sandstone (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

sedimentary

Aragonite

Aragonite (Carbonate mineral), CaCO3

mineral

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Mineral (variety of Chalcedony)

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)

Sedimentary

Chert (Flint)

SiO2 (predominantly microcrystalline or cryptocrystalline quartz)

Sedimentary rock

Ruby

Corundum (Al2O3:Cr)

mineral

Rose Quartz

Silicon dioxide (SiO2)

mineral

Pink Granite

Granite (Phaneritic igneous rock composed mainly of quartz, alkali feldspar, and plagioclase)

igneous

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

White Topaz

Topaz [Al2SiO4(F,OH)2]

mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Pegmatite (with Quartz and Feldspar)

Granitic Pegmatite

igneous

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety with hematite or goethite inclusions) Chemical Formula: (Ca,Na)(Al,Si)2Si2O8

Mineral

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

mineral

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

igneous

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

metamorphic

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Mineral

Amazonite

Amazonite (KAlSi3O8) - a variety of Microcline Feldspar

Mineral

Rough Garnet (likely Almandine or Pyrope)

Garnet group; Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3

mineral

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

mineral