Beryl (likely Pink/Morganite variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
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Quartzite cobblestone
Quartzite (primarily SiO2)
metamorphic
Mica Schist with Garnet
Garnet-Mica Schist
metamorphic
Garnet in Matrix (likely Almandine Garnet)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Quartz Geode (Cracked)
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode Part (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Schist
Mica Schist
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Diamond
Carbon (C)
mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Granitoid (Pegmatitic Granite)
Granitoid with dominant Potassium Feldspar and Quartz
igneous
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet and Quartz
Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)
mineral
Schist
Mica Schist
metamorphic
Diamond
Carbon (C)
mineral
Granitic Pegmatite (River Rock specimen)
Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)
igneous
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Beryl (Aquamarine variety)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Diamond
Carbon (C)
mineral
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
metamorphic
Quartz with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral