Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Milky Quartz (Water-worn pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Iron-stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Gold Flake
Native Gold (Au)
mineral
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Malachite
Copper carbonate hydroxide, Cu2CO3(OH)2
mineral
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Quartz (specifically Milky or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Obsidian
Volcanic Glass (Primary component: SiO2)
igneous
Obsidian
Volcanic glass (primary composition: SiO2)
igneous
Amethyst (Rose-tinted variation)
Silicon Dioxide (SiO2) with trace iron impurities
mineral
Gold
Native Gold (Au)
mineral
Amethyst (as seen in jewelry)
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sardonyx Cameo
Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz
Mineral