Quartz Chip
Silicon Dioxide (SiO2)
mineral
Category
Non Geological
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Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Chert or flint fragment
Microcrystalline quartz (SiO₂), likely iron-stained chert
sedimentary
Quartz Geode with Calcite/Siderite
Crystalline Silicon Dioxide (SiO2) with Carbonate inclusions
mineral
Quartz with inclusions
SiO2
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Amphibolite
Amphibolite (rich in amphibole and plagioclase feldspar)
metamorphic
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Greenstone
Metabasalt
metamorphic
Dendritic Opal
Dendritic Common Opal (SiO2·nH2O with Manganese oxide inclusions)
mineral
River Rock (likely Gneiss or Quartzite)
Metamorphic rock specimen (potentially Foliated Gneiss)
metamorphic
Kidney Stone (Renal Calculus)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with mineral impurities
sedimentary
Jasper and Quartz Breccia
Silicified Breccia (Quartz / Chalcedony / Hematite)
sedimentary
Limestone (fossiliferous or weathered)
Sedimentary carbonate rock primarily composed of calcium carbonate (CaCO3)
sedimentary
Jasper and Quartz Breccia
Silicified breccia (SiO2)
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Pebble with Basaltic and Quartz-rich Banding
Polymictic Lithic Pebble
sedimentary
River Cobble (Quartzite / Sandstone Gravel)
SiO2 (Quartz-rich sedimentary/metamorphic rock)
sedimentary
Red Sandstone
Sandstone (hematitic/iron-rich quartzite or arenite)
sedimentary
Conglomerate
Conglomerate Sedimentary Rock
sedimentary
Chalk (Limestone variant)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Pet Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gossan (with Limonite and Hematite)
Gossanous iron-oxide rock (Fe2O3 · nH2O)
sedimentary
Sandstone
Arenite
Sedimentary
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
sedimentary
Conglomerate
Clastic Sedimentary (Conglomerate)
sedimentary
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Agate (specifically Waterline or Onyx-type Agate)
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Obsidian
Obsidian (volcanic glass), predominantly amorphous SiO₂
Igneous
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Likely citrine or yellow glass imitation in a silver-tone bracelet
Citrine: quartz, SiO₂; exact material cannot be confirmed visually
gemstone