Sedimentary And Igneous

Milky quartz

Quartz (silicon dioxide, SiO₂)

Pyrite

Iron Sulfide (FeS2)

Likely serpentinite (serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Iron-stained milky quartz

Quartz (SiO₂), with iron-oxide staining

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Iron-stained quartz-rich rock (possibly ironstone or ochre-coated quartz)

Undetermined ferruginous rock; yellow-brown coloration likely from goethite and/or limonite (hydrated iron oxides)

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary or Igneous host

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Quartz with Calcite

Silicon Dioxide and Calcium Carbonate (SiO2 + CaCO3)

Fluorite Bracelet

Calcium Fluoride (CaF2)

Pyrite

Iron Sulfide (FeS2)

Beaded Gemstone Bracelet

Composite Mineral Assemblage

Quartz (Moss-covered)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2)

Geode (Unopened)

Quartz/Chalcedony concretion

Quartz Nodule

Silicon Dioxide (SiO2)

Garnet

Garnet (X3Y2(SiO4)3)

Small rounded pebble, likely quartz-rich sandstone or granitoid fragment

Uncertain; probable quartz/feldspar-bearing lithic pebble

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Likely biotite-rich schist

Mica schist, composed chiefly of biotite and quartz; exact identification is uncertain from the image.

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Geode

Quartz / Chalcedony nodule

Rounded river pebble, likely quartz-rich sandstone or weathered igneous rock

Indeterminate; possibly quartzite, sandstone, or fine-grained granitic rock

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Muscovite-rich schist (mica schist)

Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), with possible quartz and feldspar

Likely iron-rich river cobble (weathered basalt or ironstone)

Indeterminate; possibly weathered basalt, with hematite/goethite staining

Hematite cameo or hematine imitation

Hematite (Fe₂O₃); possibly synthetic hematine or black glass

Likely mica-rich schist (possibly phyllite)

Muscovite–biotite schist; exact identification requires examination of a fresh surface

Green Fluorite

Calcium Fluoride (CaF2)

Geode

Quartz / Chalcedony nodule

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Likely biotite-bearing schist

Mica schist, probably biotite-rich; exact identification is uncertain from the photo

Biotite-rich schist (probable)

Mica schist, likely biotite–quartz–feldspar schist; exact minerals require testing

Mica-rich schist

Mica schist, likely quartz–mica schist (quartz with muscovite and/or biotite)

Mica-rich schist (probable)

Foliated quartz–mica schist; likely containing quartz, muscovite and/or biotite

Gneiss

Gneiss (Metamorphic Rock)

Garnet Gneiss

Gneiss containing Almandine Garnet

Opal

Hydrated Silica (SiO2·nH2O)