Mineral With Metamorphic Or Sedimentary Host

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Quartz (or Chalcedony) Specimen

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz pebble with a conchoidal chip

Silicon dioxide (SiO2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Quartz pebble

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (or Vein Quartz)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Quartz Vein / Quartz Matrix

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Rounded quartz-veined pebble

Likely quartz-veined metamorphic rock; exact host rock is indeterminate from the image

Bull Quartz with Mica and Host Rock

Massive Quartz (SiO2) with Muscovite/Chlorite inclusions

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Banded Gneiss with Quartz Vein

Gneiss containing SiO2 (Quartz) intrusion

Gold Quartz (Auriferous Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium aluminum silicate hydroxide fluoride [KAl2(AlSi3O10)(F,OH)2]

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Veined Limestone (or Quartz-Veined Slate/Shale)

Metamorphosed Sedimentary Rock with Calcite/Quartz Veins

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Fossilized bone fragment (probable vertebrate bone)

Permineralized bone; exact taxon indeterminate from the image

Quartz with Inclusions

Silicon Dioxide (SiO2)

Zoisite with Ruby

Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)

Garnet

Garnet (X3Y2(SiO4)3)

Auriferous Quartz or Pyritic Ore

Iron Pyrite (FeS2) or Native Gold (Au) in Matrix

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Tumbled green aventurine (probable)

Quartz aggregate, predominantly SiO₂, with green fuchsite mica inclusions

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)