RockWoofFound alongside
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
10 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
3 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Howard County (6) · Montgomery County (3) · Carroll County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Ben Murphy Mica-Beryl Mine | — | — | Past Producer | 39.139, -76.917 |
| Biddison Pegmatite Deposit | — | — | Prospect | 39.331, -76.907 |
| B Giancola Quarry | Mica | — | Producer | 39.013, -77.153 |
| Maryland Mica Company Mine | Mica | — | Past Producer | 39.172, -76.904 |
| Gilmore Mine | Mica | — | Past Producer | 39.088, -77.030 |
| Parlet Prospect | Mica | — | Prospect | 39.171, -76.902 |
| Gudelsky Farm | Mica | — | Prospect | 39.181, -76.877 |
| Earth Products Company Mines | Feldspar | — | Past Producer | 39.124, -76.913 |
| George Iager Beryl-Mica Prospects | — | — | Past Producer | 39.139, -76.912 |
| Henryton Pegmatite | Beryllium | — | Prospect | 39.352, -76.912 |
Back to Rockhounding in Maryland.
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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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