Mixed: Igneous And Sedimentary

Likely tumbled quartz or calcite pebble

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Chalcedony (Dyed Agate and Citrine-style Quartz)

Silicon Dioxide (SiO2)

Concrete Fragment

Hardened Portland Cement Composite

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Specular Hematite

Hematite (Fe2O3)

Iron-rich laterite (probable)

Laterite; iron oxides/hydroxides, commonly goethite and hematite mixed with clay minerals

Pyrite

Iron Disulfide (FeS2)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz (likely rose quartz or included quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled pink-and-white quartz

Quartz, silicon dioxide (SiO₂), likely rose quartz mixed with milky quartz

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Orange mineral fragment, possibly citrine or iron-stained quartz

Quartz (SiO₂), tentatively iron-included quartz/citrine

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Iron-rich rock, likely hematite/goethite-rich ironstone

Hematite (α-Fe₂O₃), possibly mixed with goethite (FeO(OH)) and gangue minerals

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Pyrite

Iron Sulfide (FeS2)

Galena

Lead Sulfide (PbS)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)

Silicon Dioxide (SiO2)

Red-brown iron-rich mineral specimen, likely hematite/goethite

Hematite (Fe₂O₃), possibly mixed with goethite (FeO(OH)) and iron oxides

Polished/tumbled brecciated jasper (likely rainforest or ocean jasper)

Microcrystalline quartz (SiO₂), commonly mixed with chalcedony, iron oxides, and other silicates

Amazonite-like microcline bead bracelet

Microcline feldspar, KAlSi₃O₈; likely mixed with pale amazonite, quartz, or other feldspar beads

Mixed Agate and Lapis Lazuli Bracelet

Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Natural quartz crystal (likely herkimer-style quartz)

Quartz, silicon dioxide (SiO₂)

Likely raw garnet fragment

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Garnet-bearing granite or pegmatitic granitic rock

Coarse-grained granitoid, likely granite or pegmatite, composed mainly of quartz and feldspar with almandine/spessartine garnet and dark biotite or amphibole

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Quartz (in matrix)

Quartz (SiO₂)

Red jasper chips

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Polished pale chalcedony or quartz pebble

Microcrystalline quartz, SiO₂; possibly milky quartz/chalcedony

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Blue sodalite (likely rough fragments)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly mixed with blue calcite or lapis lazuli

Green Fluorite

Calcium Fluoride (CaF2)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Carnelian / Chalcedony

Cryptocrystalline Quartz (SiO2)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)