Malachite
Malachite (Cu2CO3(OH)2)
Category
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Malachite
Malachite (Cu2CO3(OH)2)
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
Rough Diamond
Diamond (pure Carbon, C)
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
Chert
Cryptocrystalline Quartz (SiO2)
Diamond
Native Carbon (C)
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Quartzite
Metamorphic Quartzite (SiO2)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Banded Chert
Microcrystalline Quartz (SiO2)
Blue calcite sphere
Calcite (CaCO₃), commonly blue-calcite variety
Diamond
Diamond (pure carbon; C)
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Smoky Quartz
Silicon Dioxide (SiO2) with trace aluminum and irradiation
Diamond
Carbon (C), Native Element
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Chert
Microcrystalline quartz (SiO2)
Petoskey Stone
Favosites alpenensis
Graphite
Graphite (Carbon, C)
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
Diamond
Carbon (C)
Chert (Flint)
Chert (SiO2)
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (Nodule)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
Brown Chert
Microcrystalline Quartz (SiO2)
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
Diamond
Carbon (C)
Raw Diamond
Carbon (C)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)