Sedimentary (Secondary Mineral Formation)

Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.

Red Jasper or Chert

Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)

sedimentary

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

mineral

Sapphire (Corundum)

Corundum (Al2O3)

mineral

Banded Iron Formation (BIF) / Tiger Iron

Banded Iron Formation containing Hematite (Fe2O3) and Magnetite (Fe3O4)

sedimentary

Red Jasper (Heliotrope family variant)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

sedimentary

Iron-Stained Quartz Pebble

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

mineral

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

mineral

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

igneous

Yellow Aventurine (Yellow Quartzite)

Silicon Dioxide (SiO2) with inclusions

metamorphic

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

sedimentary

Diamond (as set in a gold ring)

Carbon (C)

mineral

Diamond

Carbon (C)

mineral

Diamond

Diamond (pure Carbon, C)

mineral

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

mineral

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Fairburn Agate / Agate-bearing Breccia

Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix

sedimentary

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

mineral

K2 Jasper (K2 Granite)

Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)

igneous

Carnelian

Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)

mineral

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

Mineral

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

mineral

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

metamorphic

Basalt River Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

igneous

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

sedimentary

Basalt with Quartz Veins

Basalt (SiO2 range 45-52%)

igneous

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Agate

Silicon Dioxide (SiO2) - Banded Chalcedony

mineral

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

mineral

Milky Quartz (Water-Worn Pebble)

Quartz (Silicon Dioxide, SiO2)

mineral

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)

igneous

Limestone

CaCO3 (Mainly Calcite or Aragonite)

sedimentary

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral