Limonite Concretion
Limonite (Hydrated iron oxide) FeO(OH)·nH2O
sedimentary
Category
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Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities), SiO2
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with high Iron Oxide impurities
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
White Agate (Chalcedony)
Chalcedony (SiO2)
mineral
Serpentinite
Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Pyritic Mudstone
Argillaceous rock (FeS2)
sedimentary
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Banded gneiss
Gneiss, chiefly quartz–feldspar–mica (variable composition)
metamorphic
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral
Schist
Mica Schist
metamorphic
Moonstone (Tumbled)
Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Carnelian
Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)
mineral
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities) - SiO2
mineral
Golden Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Amazonite
K(AlSi3O8), Microcline
mineral
Gneiss (probable banded metamorphic rock)
Banded gneiss; typically quartz–feldspar–mica assemblage
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Amazonite
K(AlSi3O8) - Potassium aluminum silicate
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Rose Quartz in Matrix
Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese
mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Carnelian Agate Nodule
Chalcedony (SiO2) with Iron Oxide inclusions
sedimentary
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
mineral
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities) - SiO2
mineral