Sedimentary Or Igneous Associated Mineral

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Likely rough quartz-bearing mineral specimen

Quartz (silicon dioxide, SiO₂), possibly iron-stained quartz or quartz-rich rock

Chalcedony (Yellow Agate)

Cryptocrystalline Quartz (SiO2)

Turquoise (possible Dyed Magnesite/Howlite)

CuAl6(PO4)4(OH)8·4H2O

Green Gneiss or Greenschist

Chlorite/Actinolite Gneiss or Schist

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sodalite

Na8(Al6Si6O24)Cl2

Pyrite

Iron Disulfide (FeS2)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and biotite/hornblende

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Hematite

Iron(III) oxide (Fe2O3)

Chalcedony (Agate/Jasper mix)

Cryptocrystalline Sillimanite (Quartz) - SiO2

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Unopened Geode

Geode (containing various mineralization like Quartz SiO2)

Tumbled or naturally broken quartz crystal

Quartz (silicon dioxide, SiO₂)

Quartz (specifically Milky/White Quartz)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Gneiss

Foliated Metamorphic Gneiss

Epidote-bearing Rock

Epidote / Silicate mineral aggregate

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Mica-rich metamorphic rock, likely biotite schist

Biotite–quartz schist; probable composition of quartz, biotite, feldspar, and minor sulfide or iron-oxide minerals

Dalmatian Stone

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)

Silicon Dioxide (SiO2) with various inclusions

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a feldspathic or carbonate-rich matrix

Gneiss

High-grade regional metamorphic rock

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite

Amazonite-bearing feldspar (likely raw amazonite)

Amazonite, a blue-green variety of microcline feldspar; KAlSi₃O₈

Quartz-bearing weathered rock

Massive to drusy quartz (SiO₂), possibly in a feldspathic or carbonate host

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)

Geode

Quartz / Chalcedony nodule