Sedimentary Or Metamorphic Derived

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide with Hematite inclusions), SiO2

Fancy Jasper

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz heart (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Rounded brown quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Schist (Micaceous Schist)

Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)

Weathered dark stone, possibly basalt

Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine

Schist

Mica Schist (Medium-grade metamorphic rock)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Schist

Schist (Crystalline metamorphic rock)

Likely weathered quartz-rich pebble

Quartz (SiO₂), possibly iron-stained quartz or quartzite

Likely iron-stained quartz or feldspar fragment

Quartz (SiO₂) or potassium feldspar (KAlSi₃O₈), uncertain from image

Weathered quartz-rich pebble

Likely quartz-bearing granite or granitic gneiss; exact identification requires testing

Quartzite Pebble

Metamorphic Quartzite

Small tan rock fragment

Indeterminate; possibly quartz-rich sandstone or iron-stained quartz

Carnelian

Chalcedony (SiO2) with Iron Oxide inclusions

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheets with Quartz)

Green-and-black mottled metamorphic rock (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.

Greenstone (likely serpentinite or greenstone pebble)

Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite

Fuchsite on Quartzite

Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2

Likely tumbled quartz or chalcedony fragment

Quartz (SiO₂), possibly microcrystalline chalcedony

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Schist

Mica Schist

Ruby in Zoisite

Anyolite (Zoisite with Corundum and Tschermakite/Pargasite)

Anyolite (Ruby in Zoisite)

Metamorphic rock composed primarily of green Zoisite (Ca2Al3(Si2O7)(SiO4)O(OH)), red Ruby (Al2O3:Cr), and black Tschermakite

Ruby Zoisite

Anyolite (Zoisite with Ruby and Pargasite)

Ruby in Zoisite

Anyolite (Zoisite with Corundum) Member of the Epidote Group

Unakite

Altered Granite (Granitic Metamorphic Rock)

Ferruginous Quartz

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

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Iron-stained quartzite or quartz-rich sandstone

Quartzite, predominantly SiO₂, with iron-oxide staining

Mica Schist

Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

Schist

Mica Schist (Medium-grade Metamorphic Rock)