Sedimentary And Igneous

Pyrite

Iron Sulfide (FeS2)

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

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary or Igneous host

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Fluorite Bracelet

Calcium Fluoride (CaF2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Moss-covered)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2)

Geode (Unopened)

Quartz/Chalcedony concretion

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

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

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

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

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

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

Green Fluorite

Calcium Fluoride (CaF2)

Geode

Quartz / Chalcedony nodule

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Gneiss

Gneiss (Metamorphic Rock)

Garnet Gneiss

Gneiss containing Almandine Garnet

Opal

Hydrated Silica (SiO2·nH2O)

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

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

Indeterminate lithic clast; possible quartz–feldspar aggregate

Quartz Geode

Silicon Dioxide (SiO2)

Geode

Quartz nodule / Chalcedony-lined cavity

Fluorite

Calcium Fluoride (CaF2)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Mica-rich metamorphic rock, likely biotite schist

Biotite–quartz schist; probable composition of quartz, biotite, feldspar, and minor sulfide or iron-oxide minerals

Quartz Geode / Druzy Quartz Node

Silicon Dioxide (SiO2)

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Gneiss (with Garnet)

Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Geode with Quartz Crystals

SiO2 (Silicon Dioxide) in a geode formation

Fluorite

Calcium Fluoride (CaF2)