Polished green aventurine (likely)
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Mica-rich granite (likely biotite granite)
Biotite granite; mainly quartz (SiO₂), alkali/feldspar, and biotite mica
igneous
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Diamond
Carbon (C)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Weathered volcanic rock, likely andesite or basalt
Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals
igneous
Granodiorite
Granodiorite
Igneous
Orange Calcite / Quartzite with Iron Staining
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities
mineral
Basalt (River Pebble)
Extrusive Mafic Igneous Rock
igneous
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Quartzite with Hematite staining
Metamorphic Quartzite (SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (C)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Quartz (Yellow/Citrine Variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Diorite with Quartz contact
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Slag Glass
Silicon dioxide with impurities
mineral
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Pink Granite
Granite (Phaneritic intrusive rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Diamond
Carbon (C)
gemstone
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Native Silver
Silver (elemental Ag)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Weathered river stones, likely basaltic andesite and related volcanic rocks
Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)
igneous
Faceted Gemstone
Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass
gemstone
Pink Quartzite
Quartzite (principally Silicon Dioxide, SiO2)
metamorphic
Yellow calcite (tumbled honey or lemon calcite)
Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Granite
Felsic intrusive igneous rock (Granite)
igneous