Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Category
Sedimentary And Igneous
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss and Igneous Rock Collection
Foliated Metamorphic Rock (Gneiss) / Igneous Rocks
metamorphic
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Agate
Silicon Dioxide (Quartz), SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Agate Nodule
Silicon Dioxide (Quartz/Chalcedony), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral