Igneous, Sedimentary, And Metamorphic

Agate

Silicon Dioxide (Chalcedony), SiO2

Gravel / Small Pebble

Rock Fragment (Gravel)

Agate

Chalcedony (SiO2)

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Zoisite with Hornblende

Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz

Silicon Dioxide (SiO2)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Unidentifiable Rock Fragment

Pyrite

Iron Sulfide (FeS2)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Mixed rock and mineral collection

Assorted geological specimens; individual species cannot be reliably identified from the image

Faceted clear gemstone, likely glass or cubic zirconia

Undetermined; could be synthetic cubic zirconia (ZrO₂) or cut glass (silica-based)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Likely iron-stained quartz or quartzite fragment

Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image

Likely quartz-rich rock fragment

Unidentified pale, granular silicate specimen; possibly quartz or quartzite

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Small weathered mineral/rock fragment

Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen

Green Opal

Hydrated Silica (SiO2·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Quartz

Silicon Dioxide (SiO2)

Mixed rock and mineral collection

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

Red coral (polished coral beads)

Corallium spp.; chiefly calcium carbonate (CaCO₃, calcite)

Rounded quartz-rich river pebbles

Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification