Man Made Material

Milky Quartz with Dendritic Inclusions

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lepidolite with Tourmaline in Quartz Matrix

K(Li,Al)3(Si,Al)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Pyrite

Iron Sulfide (FeS2)

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Tumbled tree agate (dendritic agate)

Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites

Moss Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Peridotite (with Olivine and Pyroxene)

Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Fluorite

Calcium Fluoride (CaF2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Weathered quartz-rich river cobble, possibly quartzite

Quartzite (mostly microcrystalline SiO₂), tentatively identified

Polished red jasper beads

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Fossilized Bone

Vertebrate fossil (mineralized bone)

Polished/tumbled brown jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite

Pink Granite

Granite (Felsic Plutonic Rock)

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Serpentinite (serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

Rounded iron-rich pebble

Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing

Tumbled light-colored stone, possibly quartzite or limestone

Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Mica-rich schist, likely lepidolite or muscovite schist

Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite

Coarse-grained mica-bearing metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Tumbled pink-and-white quartz

Quartz, silicon dioxide (SiO₂), likely rose quartz mixed with milky quartz

Quartzite Pebble (with mineral veining)

Metamorphic Quartzite (SiO2)

Diamond (Faceted)

Carbon (C)

Diamond

Diamond (C)

Diamond (Princess Cut Gemstone)

Carbon (C)

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals, commonly lizardite, chrysotile, or antigorite, with possible magnetite and relict olivine/pyroxene

Serpentinite (likely polished/tumbled)

Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, and chrysotile, with magnetite and accessory carbonates

Chert (often called Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Siltstone or Fine-grained Sandstone pebble

Siltstone (primarily SiO2 with clay minerals)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Sandstone)

Blue-green fluorite (likely tumbled/polished)

Fluorite, calcium fluoride (CaF₂)

Rose Quartz

Silicon Dioxide (SiO2)