Limonite (Yellow Ochre)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Category
Not A Geological Specimen
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River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Fluorite
Calcium Fluoride (CaF2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide (FeO(OH)·nH2O)
sedimentary
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Quartz Druzy in Brecciated Matrix
Silicon Dioxide (SiO2) in Lithic Breccia
sedimentary
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Moqui Marble
Ironstone Concretion (Goethite/Hematite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Opalite
Synthetic Opalised Glass
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Fluorite (Green Fluorite on Host Rock)
Fluorite (Calcium Fluoride, CaF2)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Bauxite
Bauxite (mainly Al(OH)3, AlO(OH))
sedimentary
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Obsidian
Obsidian (Volcanic Glass)
igneous
Amber
Succinite
Organic mineraloid
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Silver (Native Element)
Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen
mineral
Agate
Silicon dioxide (SiO2)
mineral
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Succinite (C10H16O)
mineraloid
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic