Mineral With Metamorphic Or Igneous Host

Orange Aventurine (or Tumbled Carnelian)

Quartz (SiO2) with inclusions

Likely garnet, possibly almandine

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz vein in host rock

Milky quartz (SiO₂), likely in a metamorphic host such as schist or gneiss

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz-rich rock fragment, possibly milky quartz with iron staining

Quartz (SiO₂), potentially vein quartz or quartz-bearing pegmatite

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Quartz in Matrix (or Quartz Vein Rock)

Silicon Dioxide (SiO2) with host rock

Quartz-veined Diabase or Basalt Pebble

Diabase or Basalt with Hydrothermal Quartz Veins (SiO2)

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Quartzite with Epidote Vein

Metamorphosed Quartz Sandstone with Hydrothermal Vein

Milky quartz vein rock

Quartz, SiO₂; likely massive vein quartz with iron-oxide staining

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Gold Ore

Native Gold (Au) in Matrix

Garnet

Garnet-group silicate, likely almandine–spessartine; general formula X₃Y₂(SiO₄)₃

Honey-colored quartz cluster

Quartz, silicon dioxide (SiO₂), likely iron-stained or included quartz

Quartz vein in weathered host rock

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

Aventurine

Quartz (SiO2) with Fuchsite inclusions

Likely quartz-rich rock (milky quartz vein material)

Quartz, SiO₂; identification is provisional from the photo

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-bearing weathered rock

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

Small quartz-rich stone, possibly iron-stained quartz or jasper

Quartz (SiO₂), potentially with iron-oxide inclusions

Tumbled milky quartz, possibly quartzite

Quartz (SiO₂); the specimen may be a quartz-rich metamorphic rock if its texture is granular

Bornite (“peacock ore”), likely chalcopyrite-bearing sulfide specimen

Bornite, Cu₅FeS₄, commonly intergrown with chalcopyrite (CuFeS₂) and oxidized copper sulfides

Ruby (Pink to Red Corundum)

Al2O3 (Corundum with Chromium impurities)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Massive quartz (milky quartz), possibly quartz-rich mineral aggregate

Quartz, silicon dioxide (SiO₂)

Quartz vein specimen

Quartz (SiO₂), likely drusy or massive quartz on host rock

Quartz Vein in Gneiss/Granite

Silicon Dioxide (SiO2) in Feldspar-Quartz Gneiss host rock

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Probable tumbled garnet

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Milky quartz-bearing rock

Quartz (SiO₂), likely massive quartz with minor iron-oxide inclusions

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)