Sedimentary Or Metamorphic Derived

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)

Quartz heart (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Pyrite-bearing rock, possibly pyrite-rich schist or quartzite

Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Aventurine (Fuchsite-bearing Quartz)

Silicon Dioxide with Chromium-rich Muscovite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Ruby in Zoisite (Anyolite)

Ruby-Zoisite

Quartz Vein in Matrix (Breccia / Host Rock with Quartz)

Silicon Dioxide (SiO2) in Host Rock Matrix

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Red Aventurine (Strawberry Quartz)

Silicon Dioxide (SiO2) with inclusions of Hematite or Goethite

Likely weathered quartzite pebble

Quartzite, predominantly SiO₂

Slate or fine-grained shale

Slate; predominantly quartz, mica, and clay-derived minerals

Pyrite-bearing rock (iron pyrite)

Pyrite, FeS₂, likely disseminated or massive in a host rock

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Dark gray rock fragment (tentative basalt or slate)

Indeterminate; possibly fine-grained basalt, or metamorphic slate

Polished serpentine (likely)

Serpentine-group minerals, chiefly antigorite and lizardite; commonly derived from altered peridotite

Fuchsite in Quartz

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz (SiO2)

Garnet

Garnet Group (e.g., Almandine, Pyrope)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Banded gneiss (likely biotite-rich gneiss)

Gneiss; chiefly quartz, feldspar, biotite, and possibly hornblende

Greenschist (Greenstone)

Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Mica Schist

Mica Schist (primarily Muscovite or Biotite within a foliated matrix)

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Pyrite

Iron Disulfide (FeS2)

Amazonite (Microcline Feldspar)

Microcline Feldspar - KAlSi3O8

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Raw Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite)

Weathered quartz-rich pebble

Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the photograph

Rounded reddish-brown river pebble

Indeterminate weathered silicate rock, possibly granite, rhyolite, or iron-stained quartzite

White quartz-rich pebble

Quartz (SiO₂), possibly milky quartz or quartzite

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / MgCO3 (Magnesite substrate)

Carnelian

Carnelian (SiO2 variant)

Mica Schist

Schist (muscovite-biotite schist)