Sedimentary And Metamorphic

Greenstone

Metamorphosed Mafic Igneous Rock

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Garnet Schist

Almandine-Muscovite Schist

Gneiss

Gneiss (a type of metamorphic rock)

Quartz River Pebbles

Silicon Dioxide (SiO2)

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay-mineral impurities

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Blue Dumortierite in Quartz

Al7(BO3)(SiO4)3O3 (Dumortierite)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Polished red gemstone pendant, likely red jasper or brecciated jasper

Jasper: microcrystalline quartz (SiO₂), commonly with hematite or iron-oxide inclusions

Likely weathered sandstone or quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Epidote

Epidote - Ca2(Al,Fe)3(SiO4)3(OH)

Pyrite

Pyrite (FeS₂)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony Pebble / Rough Agate

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

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

Silicon Dioxide (SiO2) with various inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Hematite

Iron(III) oxide (Fe2O3)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Polished zebra jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and manganese-rich banding

Quartz

Silicon Dioxide (SiO2)

Quartz (Tumbled/Water-worn pebble)

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Calcite

Calcium Carbonate (CaCO3)