Mineral Health

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Limonite (Iron Ore/Bog Iron)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Unidentified rough mineral fragments

Likely quartz- or feldspar-bearing rock; exact identification requires testing

Quartz-bearing pegmatitic rock, likely granite/pegmatite

Feldspar–quartz pegmatite; chiefly K-feldspar, plagioclase, quartz, and possible mica

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Quartz-bearing pegmatite

Quartz (SiO₂) with feldspar and mica, likely a granitic pegmatite

Magnetite (Lodestone)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Sandstone Pebble

Arenite (Sandstone)

Sandstone

Arenite (SiO2 primarily)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Pegmatite (with Muscovite Mica and Quartz)

Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Granite

Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)

Gneiss

Gneiss

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

Banded Gneiss

Gneiss (Metamorphic Rock)

Diorite

Diorite

Limonite (often after Pyrite)

Limonite (FeO(OH)·nH2O)

Copper Ore (with Malachite/Chrysocolla and Iron Oxides)

Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Vanadinite

Pb5(VO4)3Cl

Turquoise

CuAl6(PO4)4(OH)8"""""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" • 4H2O (Hydrated copper and aluminum phosphate)

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Limonite

FeO(OH)•nH2O

Hematite (Botryoidal / Kidney Ore)

Iron Oxide (Fe2O3)

Limonite with Ironstone

Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O

Fluorite

Calcium fluoride (CaF2)

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

Limonite (Iron Ore)

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

Limonite (Ironstone)

Hydrous ferric oxides (FeO(OH)·nH2O)

K2 stone (azurite–granite)

Biotite granite hosting blue azurite (Cu₃(CO₃)₂(OH)₂), often with malachite and quartz

Limonite (Yellow Ochre)

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

Tumbled greenstone pebble

Greenstone (metamorphosed mafic volcanic rock; commonly chlorite, actinolite, epidote, and albite)

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)