Likely quartz-rich metamorphic rock (quartzite or milky quartz)
Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining
metamorphic
Category
Man Made Material (Jewelry, Metal Alloy)
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Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Pyrite
Iron Disulfide (FeS2)
Mineral
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Tumbled labradorite
Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral
Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)
fossil
Agate Nodules
Cryptocrystalline Quartz (SiO2)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Jasper (Green Jasper/River Stone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Marble (polished)
Recrystallized Calcite (CaCO3)
metamorphic
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Chalcedony Geode Fragment
Microcrystalline Quartz (SiO2) within a nodule
sedimentary
Serpentine (Healerite variety)
Serpentine group, Mg3Si2O5(OH)4
metamorphic
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Tumbled amethyst
Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation
gemstone
Jasper
Silicon Dioxide (SiO2)
mineral
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Cinnabar in Quartz
Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions
Mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Weathered pegmatite or feldspar-rich granite fragment
Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph
igneous
Petoskey Stone
Hexagonaria percarinata
fossil
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Diamond
Carbon (C)
mineral
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/92ebc6b5-08ac-4229-a727-57a096ec7f2c-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Tumbled green gemstone, likely dyed howlite or serpentine
Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing
mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary