Granite
Granite
Igneous
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Simulated Mineral) in the encyclopedia
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Iron-stained quartz crystal
Quartz (SiO₂), likely iron-oxide-coated or included
mineral
Polished orbicular jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron oxides and green alteration minerals
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar
Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite
igneous
Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica (possibly gneissic if foliation is confirmed)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2)
igneous
Quartz (White Pebble) and Sandstone (Brown/Tan Fragments)
Silicon Dioxide (SiO2) for the white pebble
mineral and sedimentary
Red jasper (iron-rich chalcedony), possibly brecciated
Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Green beryl (likely aquamarine-grade beryl)
Beryl, Be₃Al₂Si₆O₁₈; blue-green color is caused mainly by iron
mineral
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic volcanic rock
igneous
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Slate
Metamorphic Rock (Fine-grained)
metamorphic
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride, CaF2
Mineral
Brecciated jasper, possibly rainforest jasper
Jasper: microcrystalline to cryptocrystalline quartz, SiO₂, commonly containing hematite, goethite, chlorite, epidote, and other iron- and manganese-bearing minerals
gemstone
Breccia
Breccia (Sedimentary Clastic Rock)
sedimentary