Sedimentary Or Metamorphic

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Jasper

Silicon dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

White Quartz Star-cut crystal

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Feldspar-rich Quartzite

Metamorphic Quartz-Feldspar Aggregate (SiO2 + KAlSi3O8)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Carnelian

Carnelian (a variety of Chalcedony, SiO ₂)

Shale or Slate

Shale (Sedimentary) or Slate (Metamorphic)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Pyrite (or Fool's Gold)

Pyrite (FeS₂)

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

Tumbled reddish-brown pebble, likely sandstone or iron-rich quartzite

Probable ferruginous sandstone (quartz-rich; SiO₂ with iron oxides), possibly quartzite

Jasper

Chalcedony (Microcrystalline Quartz) - SiO2

Sandstone, Quartzite, and River Pebbles

Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Jasper or Red Quartzite

SiO2 (Silicon Dioxide with iron oxide impurities)

Jasper and Quartzite mix

Silicon Dioxide (SiO2) with impurities

Worn quartz-rich pebble, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly quartzite

Mixed Agate and Lapis Lazuli Bracelet

Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Greenstone / Chert

Cryptocrystalline Quartz (SiO2) or Altered Basalt

Red Jasper (possibly with Quartz or Hematite)

Silicon Dioxide (SiO2) with iron oxide impurities

Tiger’s eye

Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos

Tumbled brown stone, likely jasper or fine-grained quartzite

Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz-dominated lithic fragment; probable quartz sandstone (SiO₂)

Rounded river pebble, likely quartz-rich sandstone or fine-grained quartzite

Indeterminate quartz-rich lithic clast; likely quartz sandstone (SiO₂-rich) or quartzite

River Pebbles (Sandstone and Quartzite)

SiO2 (Quartz) dominated clastic rocks

Micaceous Sandstone or Quartzite

Sandstone (lithified quartz grains, often with mica) or Quartzite (metamorphosed sandstone)