Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
Category
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
Diamond (in a jewelry setting)
Cubic Carbon (C)
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
Obsidian
Volcanic Glass (SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Quartzite
Metamorphic quartz rock (SiO2)
Quartzite
Quartzite (Metamorphosed Sandstone)
Quartzite
Metamorphic Quartz Rock (SiO2)
Quartzite
Metamorphic Quartz Arenite
Red Quartzite
Quartzite (SiO2)
Diamond
Native Carbon (C)
Diorite (Gneissic)
Diorite
Diamond (faceted)
Diamond (Pure Carbon, C)
Pearl
Aragonite (CaCO3) with Conchiolin
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
Granite
Phaneritic plutonic felsic rock
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
Orgonite Pyramid (containing Amethyst and mixed minerals)
Silicon Dioxide (SiO2) in synthetic resin
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
Granite
Felsic intrusive igneous rock
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
Diamond
C (Carbon)
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
Diamond
Carbon (C)
Diamond
Diamond (pure Carbon, C)
Rough Diamond
Pure Carbon (C)
Obsidian
Volcanic glass
Obsidian
Volcanic glass (SiO2)
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Red Quartzite
Quartzite (Metamorphic quartz sandstone)