Mineral Like Byproduct

Browse mineral like byproduct specimens identified by the Rock Identifier community.

Blue Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

sedimentary

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral

Blue Lace Agate (Geode/Druzy variant)

Chalcedony (SiO2) with Quartz druzy

mineral

Agate (Banded Chalcedony)

Agate (Silicon Dioxide, SiO2)

mineral

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Petrified Wood

Silicified Wood (SiO2)

mineral

Banded Gneiss

Gneiss (variable mineral composition)

metamorphic

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

mineral

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

sedimentary

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

mineral

Amygdaloidal Basalt

igneous

Quartz with mica and feldspar (Pegmatite fragment)

Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)

igneous

Gneiss

metamorphic

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

igneous

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

mineral

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

sedimentary

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

mineral

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

metamorphic

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

Mineral

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

mineral

Dyed Howlite

Borosilicate hydroxide (Ca2B5SiO9(OH)5)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Disulfide (FeS2)

mineral

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

sedimentary

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)

mineral

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

metamorphic

Granatic Pegmatite

Pegmatitic Granite

igneous

Granitic Pegmatite

Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)

igneous

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

mineral

Blue Chalcedony Geode (with Quartz Druzy)

Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz

mineral

Smoky Quartz with Amethyst

Silicon Dioxide (SiO2)

mineral

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Mineral

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

mineral

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral