Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Category
This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Blue Agate (likely Dyed)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Sunstone
Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Bismuth
Bismuth (Bi)
Mineral
Rough Quartz Crystal in Matrix
Silicon Dioxide (SiO2)
mineral
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Gneiss (likely)
Gneiss
Metamorphic
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Silver (Jewelry Specimen)
Native Silver (Ag)
Mineral (Native Element)
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Basalt (with possible quartz veinsing)
Basalt
igneous
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper (Amygdaloidal Basalt with Agate)
Silicon dioxide (SiO2) in Basalt host
igneous
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous