Metamorphic Or Sedimentary (With Staining)

Pyrite-bearing rock (iron pyrite)

Pyrite, FeS₂, likely disseminated or massive in a host rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartzite Pebble

Quartzite

Quartz-rich mica schist

Muscovite–quartz schist, with possible feldspar and iron-oxide staining

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Likely quartz-rich gravel fragment (uncertain identification)

Quartz, silicon dioxide (SiO₂), possibly mixed with feldspar or other light-colored minerals

Labradorite-bearing gneiss or altered feldspathic rock

Plagioclase-rich gneiss, locally labradorescent; composition likely plagioclase feldspar, quartz, mica, and iron-oxide veining

Likely graphite-rich schist

Graphitic schist; chiefly graphite and quartz/mica

Weathered gneissic or granitic rock

Quartz–feldspar–biotite gneiss (tentative; possibly weathered granite)

Quartzite (with Iron Staining)

Metamorphic Quartzite (SiO2)

Red Quartzite

Quartzite (SiO2)

Small quartz pebble or silica-rich mineral fragment

Quartz (SiO₂), tentative

Jasper with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Small brown rock fragment

Undetermined; possibly weathered iron-stained quartzite or chert

Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (Iron-rich)

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Quartz pebble or quartz-rich fragment

Quartz (silicon dioxide, SiO₂), possibly iron-stained or included

Weathered quartz-rich cobble (likely quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Quartz-bearing weathered rock

Massive to drusy quartz (SiO₂), possibly in a feldspathic or carbonate host

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Sand / Sandstone grains

Silicon Dioxide (SiO2)

Rounded quartz-rich cobble, likely sandstone or quartzite

Quartz-dominated siliciclastic rock; possibly quartz arenite (sandstone) or quartzite, mainly SiO₂

Rounded river pebbles, likely quartz-rich sandstone or quartzite

Indeterminate quartz–feldspar rock; possible quartzite or arkosic sandstone

Green Jasper (Chert)

Microcrystalline Quartz (SiO2) with iron/clay inclusion

Milky quartz

Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen

Pyrite-bearing rock, likely quartz vein

Pyrite (FeS₂) in quartz-rich host rock

Quartzite River Cobble

Quartzite (dominated by SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Jasper (Green Jasper/River Stone)

Silicon Dioxide (SiO2) with impurities

Rounded quartz-rich pebble, likely quartzite

Quartzite (microcrystalline quartz, SiO₂), possibly quartz-rich sandstone

Tumbled chalcedony or quartzite pebble

Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing

Banded gneiss (possibly migmatitic gneiss)

Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)