Sedimentary Or Metamorphic Derived

Rhodochrosite

Manganese Carbonate (MnCO3)

Blue Apatite

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

Gneiss with Iron Staining and Sulfide Mineralization

Metamorphic Gneiss / Amphibolite with Iron/Sulfide Oxidation

Dark metamorphic rock, likely schist or slate fragment

Indeterminate; possibly biotite schist, chlorite schist, or slate

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Mica Schist with Iron Staining

Mica Schist

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Orange Quartzite (or Yellow Jasper / Carnelian Chalcedony)

Silicon Dioxide (SiO2)

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Rounded quartz-rich river pebble

Likely quartz-rich sandstone or quartzite pebble; composition chiefly SiO₂ with possible feldspar and mica

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Weathered schist or foliated metamorphic rock

Mica-quartz schist, tentatively; mineral composition likely quartz, mica, and feldspar

Hematite

Ferric Oxide (Fe2O3)

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Greenschist

Greenschist (containing Chlorite, Actinolite, and Epidote)

Slate

Slate; fine-grained foliated metamorphic rock, commonly derived from shale or mudstone

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Epidote with Quartz Vein

Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))

Polished hematite sphere

Hematite (Fe₂O₃), likely a polished specular or massive variety

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite inclusions)

Amethyst and Calcite collection

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Mica Schist

Schist (muscovite-biotite rich)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Dark rounded pebble

Likely basalt or another fine-grained mafic volcanic rock; exact identification is uncertain from the image

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Mica Schist with Pyrite

Muscovite/Biotite Schist (Complex Silicate)

Red Jasper

Red Jasper (SiO2 with Hematite inclusions)

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Small quartz pebble or silica-rich mineral fragment

Quartz (SiO₂), tentative

Mica Schist

Mica Schist (primarily Muscovite and/or Biotite composition)

Mica Schist

Mica Schist

Pyrite in Matrix (Healers Gold / Pyrite Egg)

Iron Disulfide (FeS2) with Magnetite/Hematite matrix

Blue Kyanite

Kyanite (Al2SiO5)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Likely tumbled hematite or hematite-rich ironstone

Hematite (Fe₂O₃), possibly magnetite-bearing ironstone