Quartz (Milky/Common)
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Not A Geological Specimen
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Calcite
Calcium Carbonate (CaCO3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Formula: C10H16O)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Polished Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Limonite-stained Chert/Jasper
Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)
sedimentary
Jasper (Green Jasper/Heliotropic Chert)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Granite (with Beryl/Aquamarine)
Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)
igneous
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limonite with Ironstone
Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Quartz with Mica (likely Muscovite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride
igneous/metamorphic
Tiger's Eye (Tumbled Blue/Black-Golden variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Granite Water-Worn Pebble
Felsic intrusive igneous rock (Granite)
igneous
Tree Agate (Dendritic Agate/Quartz)
Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions
mineral
Hematoid Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Goldstone
Aventurine glass
mineral (man-made glass)
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Amber
Succinite (fossilized tree resin)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Mica (Biotite and Muscovite) in Matrix
Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)
igneous
Amber
Succinite
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral