Antropogenic (Man Made Industrial Byproduct)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Limestone

Calcium Carbonate (CaCO3)

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Fluorite

Calcium fluoride (CaF2)

Quartz vein in iron-stained host rock

Quartz (SiO₂) with limonite/goethite staining, likely in altered basalt or another dark volcanic host

Biotite mica

Biotite, a potassium–iron–magnesium phyllosilicate mica; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Fossil brachiopod or bivalve shell

Likely a fossilized brachiopod; precise genus cannot be determined from the photograph

Granite

Granite (a plutonic rock)

Sulfur

Native Sulfur (S)

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Quartzite (Lithic Artifact)

Quartzite (SiO2)

Weathered iron-rich concretion

Goethite–hematite limonite concretion, likely with quartz and clay minerals

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Sulfur

Native Sulfur (S)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Quartz-rich rock, likely milky quartz with iron staining

Mostly quartz (SiO₂); exact rock type cannot be confirmed from the image

Tumbled purple rock, likely lepidolite-bearing mica schist

Lepidolite-rich mica schist; lepidolite K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂, possibly mixed with quartz and feldspar

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite fragment

Granite

Granite (Felsic Plutonic Rock)

Iron-rich concretion or slag-like mineral fragment

Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material

Fossil fish slab

Fossilized fish remains, likely a laminated shale-hosted vertebrate fossil; exact taxon is indeterminate from the image

Crushed Limestone

Calcium Carbonate (CaCO3)

Granodiorite

Granodiorite

Polished dendritic agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese oxide and possibly calcite veins

Fossiliferous conglomerate

Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)

Rounded iron-rich pebble

Likely ferruginous sandstone or ironstone pebble; exact identification requires testing

Iron-rich concretion or weathered ironstone

Goethite–hematite-bearing ferruginous concretion; exact identification requires testing

Polished orbicular jasper

Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other accessory minerals

Limestone

Sedimentary Calcium Carbonate (CaCO3)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Fossilized bivalve or brachiopod shell

Mineralized carbonate shell, commonly calcite (CaCO₃); exact taxon indeterminate from image

Drusy quartz coating on volcanic rock

Quartz (SiO₂), likely druzy quartz on basalt or another mafic host

Iron-stained quartz (likely quartz vein material)

Quartz, SiO₂, with iron-oxide staining (commonly goethite and/or hematite)

Fluorite (Purple/Blue variety)

Calcium Fluoride (CaF2)

Iron-rich quartzite or ironstone fragment

Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Silver (Native Element)

Ag (Argentum)

Quartz-bearing sandstone or quartzite fragment

Likely quartzite with iron-oxide staining; exact identification is uncertain from the photograph

Weathered iron-rich sandstone or ferruginous conglomeratic rock

Ferruginous sandstone, likely hematite/goethite-bearing quartz sandstone