Tree Agate
Silica (SiO2) with Chlorite inclusions
mineral
Category
Mineral Based Human Made Alloy
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Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Graphite
Carbon (C)
mineral
Limestone Gravel
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Granite
Felsic Plutonic Rock
igneous
Mica Schist
Mica Schist (primarily Muscovite and Quartz composition)
metamorphic
Colorless Quartz (Rhinestone)
Silicon Dioxide (SiO2)
mineral
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Gneiss
Gneiss
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Granite
Granite (composed of quartz, potassium feldspar, plagioclase, and mica/biotite)
igneous
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Carnelian
Carnelian (microcrystalline variety of Quartz, SiO2)
mineral
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Gold
Gold (Au)
Mineral
Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Yellow Ochre / Limonite
FeO(OH)·nH2O (Hydrated Iron Oxide Mix)
mineral
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Quartz (SiO2)
mineral
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
Schist
Mica Schist
metamorphic
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often referred to as Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Golden/Yellow Variety)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (containing Flint and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic
Galena
Lead Sulfide (PbS)
mineral