Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Weathered jasper-rich ironstone

Brecciated jasper/chert with iron oxides and hydroxides (SiO₂ with hematite, goethite, and limonite)

Limonite/Ironstone

Limonite (Hydrous ferric oxides), FeO(OH)·nH2O

Likely iron-rich rock or metallic mineral fragment

Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Vesicular basalt with an amygdule cavity

Vesicular basalt, likely with secondary quartz or calcite mineralization

Porphyritic Basalt or Amygdaloidal Basalt

Porphyritic Extrusive Igneous Rock

Weathered, vesicular volcanic rock (likely basaltic scoria)

Scoria, probably basaltic; exact identification requires testing

Limonite

Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O

Quartz-rich druse specimen

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica

Quartz pebble with iron inclusions

Silicon Dioxide (SiO2)

Ironstone Matrix with Jasper / Chert

Ferruginous Chert / Limonitic Jasper (SiO2 with Fe-oxides)

Iron-rich laterite (hematitic limonite)

Laterite composed mainly of hematite (Fe₂O₃), goethite (FeO(OH)), and hydrated iron oxides

Possible iron-rich meteorite

Provisional: stony-iron or iron meteorite; mineralogy may include kamacite (α-Fe,Ni) and taenite (γ-Fe,Ni)

meteorite

Altered volcanic rock, possibly andesite

Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins

Small metallic meteorite fragment (probable stony-iron or iron meteorite)

Unclassified meteoritic material; exact classification requires chemical and petrographic testing

meteorite

Iron Meteorite (likely Chondrite or weathered Iron-Nickel)

Meteorite (Fe-Ni alloy & silicates)

Quartz Pebble

Silicon Dioxide (SiO2)

Mineral (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron)

FeO(OH)·nH2O

Iron meteorite candidate

Likely iron-rich meteorite, possibly an ordinary chondrite or weathered iron meteorite; confirmation requires testing

meteorite

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Vein-filled Basalt or Diabase Pebble

Mafic igneous rock with quartz/calcite veins

Limonite (Iron Ore)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Weathered dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Turquoise

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

Turquoise

Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Gossanous Sandstone (likely Terrestrial)

Arenite with Iron-Oxide inclusions

Weathered river cobble, likely basaltic andesite

Fine-grained mafic volcanic rock; likely basalt or andesite, identification uncertain from image alone

Vesicular Basalt

Basalt (Mafic Extrusive Volcanic Rock)

Weathered basalt (possibly vesicular basalt)

Basalt; predominantly plagioclase, pyroxene, and commonly olivine

Weathered basalt (likely altered basalt)

Basalt, chiefly plagioclase feldspar and pyroxene, with possible chlorite/epidote alteration

Turquoise (possible Dyed Magnesite/Howlite)

CuAl6(PO4)4(OH)8·4H2O

Jasper and Mudstone Composite

Silicified Sedimentary Rock / Jasperoid Pebble

Limonite Nodules / Goethite

Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)

Greenschist

Greenschist (containing Chlorite, Epidote, and Actinolite)

metamorphic

Weathered copper-bearing rock, possibly malachite/chrysocolla-bearing matrix

Indeterminate; likely copper carbonate/silicate minerals in a host rock, potentially malachite (Cu₂CO₃(OH)₂) or chrysocolla (hydrated copper silicate)

Copper-bearing rock, likely chrysocolla–malachite–cuprite/goethite matrix

Hydrated copper silicate/carbonate minerals, chiefly chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O) with possible malachite (Cu₂CO₃(OH)₂), iron oxides, and quartz