RockWoofSketch map
Woof’s favorite find
Monkton Kaolin
We picked it because its USGS record mentions 1 gem or collectible mineral (Quartz) and 3 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as past producer for Aluminum. Minerals mentioned: Quartz, Mica, Feldspar. Approx. location 44.216, -73.147. USGS record.
Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.
Field cards: what kind of sites?
Produced ore or material at some point in the past.
Explored or test-dug, with no recorded production.
The mineral was noted here, without development.
Was producing when the record was made.
Status terms come from USGS MRDS records.
Mineral cards
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
2 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
1 site
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
1 site
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
1 site
Galena
Mohs 2.5–2.75. Heavy, silvery lead ore that breaks into cubes. Mindat
1 site
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
1 site
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
Hematite 2Limonite 2Manganite 1Pyrolusite 1Talc 1Steatite 1Sphalerite 1Galena 1Chalcopyrite 1Quartz 1Kaolin 1Commodities
Iron 3Manganese 2Talc-Soapstone 1Copper 1Zinc 1Lead 1Kaolin 1Aluminum 1Marble 1Dimension 1Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Boston Iron Co. Mine | Iron | Limonite | Past Producer | 44.186, -73.105 |
| Bristol Ore Bed | Iron | Manganite, Hematite, Limonite | Past Producer | 44.169, -73.122 |
| Monkton Ore Bed | Iron | Pyrolusite, Hematite | Past Producer | 44.181, -73.124 |
| Vermont Kaolin Corp. | Kaolin | Quartz, Kaolin | Past Producer | 44.192, -73.123 |
| Breadloaf Roadless Area | Copper, Zinc, Lead | Sphalerite, Galena, Chalcopyrite | Occurrence | 44.046, -72.907 |
| Granville Talc Mine | Talc-Soapstone | Talc, Steatite | Past Producer | 44.016, -72.751 |
| Monkton Kaolin | Aluminum | — | Past Producer | 44.216, -73.147 |
| Hubbell Prospect | — | — | Prospect | 44.061, -73.014 |
| Middlebury Quarry & Mill | Marble, Dimension | — | Producer | 44.012, -73.166 |
| North Bristol | — | — | Prospect | 44.147, -73.079 |
Fossil collections
The Paleobiology Database lists 7 fossil collection records in Addison County. These are research records, not public dig sites.
Nearby counties
Chittenden County · Washington County · Lamoille County · Rutland County · Orange County
Vermont mineral guides
- Tourmaline in Vermont
- Quartz in Vermont
- Garnet in Vermont
- Gold in Vermont
- Mica in Vermont
- Feldspar in Vermont
Back to all Vermont counties.
How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.
Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.
Updated