Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)
Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.
Metamorphic or Sedimentary (with staining)
Category
Man Made Material
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Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Granite (tumbled pebble)
Granite (Plutonic Igneous Rock)
Igneous Rock
Diamond
Carbon (C)
Mineral
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
Tiger’s eye
Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos
gemstone
Polished Ocean Jasper (orbicular jasper)
Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions
sedimentary
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Diamond
Diamond (C)
Mineral
Foliated metamorphic rock, likely biotite schist
Mica schist, chiefly quartz, feldspar, and biotite mica
metamorphic
Pale green tumbled mineral fragment, likely serpentine or green calcite
Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph
mineral
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Diamond
Diamond (pure carbon; C)
Mineral
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Diamond
Carbon (C), specifically in an isometric crystal system.
Mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Diamond
Diamond (pure carbon, C)
Mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary