White Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Category
Industrial Byproduct
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Unidentified Rock Fragment
Unknown
Rock
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite
Pyrite (FeS2)
Mineral
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary
Red Quartzite Pebble
Meta-quartzite (SiO2 with Hematite inclusions)
metamorphic
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Chert (specifically Chert Nodule/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Purple Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Diamond (Set in Jewelry)
C (Native Carbon)
mineral
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Orange Calcite
Calcite (CaCO3)
Mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Basalt
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Rough Emerald (Beryl)
Emerald (Be3Al2(SiO3)6 with Cr/V impurities)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)
Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Anthracite Coal
Anthracite (high-rank coal / Carbon)
metamorphic
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Quartzite
Quartzite (SiO2)
metamorphic