Tiger's Eye
SiO2 (Pseudomorph of Quartz after Crocidolite)
Category
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.
Tiger's Eye
SiO2 (Pseudomorph of Quartz after Crocidolite)
Rutilated Quartz
Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Rutilated Quartz
SiO2 with TiO2 inclusions (Rutile)
Hematite
Iron(III) oxide (Fe2O3)
Moissanite
Silicon Carbide (SiC)
Basalt
Extrusive mafic igneous rock
Lapis Lazuli (Lazurite crystals on Marble)
Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Diamond
Cubic Carbon (C)
Pyrite
Iron Sulfide (FeS2)
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Emerald
Beryl (variety Emerald), Be3Al2Si6O18 with Cr and/or V
Lapis Lazuli
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
Hematite
Iron(III) oxide (Fe2O3)
Banded Jasper
Silicon Dioxide (SiO2)
Carnelian
Carnelian (Silica, SiO2)
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Carnelian
Carnelian (Silicon Dioxide, SiO2)
Peridot (Olivine)
Olivine, (Mg,Fe)2SiO4
Aventurine (Green)
Silicon Dioxide (Quartz) with inclusions typically of Fuchsite; SiO2
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
Michigan Float Copper
Native Copper (Cu)
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
Agate
Chalcedony (cryptocrystalline quartz)
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
Green Fluorite
Calcium Fluoride (CaF2)
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Chalcedony (Agate)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
Citrine
Silicon Dioxide (SiO₂)
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2