RockWoofCheck access before you go. Most sites listed here are old mines, quarries or prospects, and many are on private land or active mining claims. Get the landowner's permission, check the rules of the agency that manages any public land, and never enter mine workings. Locations are approximate.
Found alongside
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
97 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
3 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Howard County (43) · Baltimore County (32) · Cecil County (12) · Carroll County (7) · Montgomery County (2) · Harford County (1)
Sites (first 60)
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Hamilton Quarries | Feldspar | — | Past Producer | 39.361, -76.862 |
| Arlington No. 1 Quarry | Feldspar | — | Past Producer | 39.315, -76.854 |
| Dawson Quarry | Feldspar | — | Past Producer | 39.713, -76.153 |
| Guilford and Waltersville Quarry | Feldspar | — | Past Producer | 39.331, -76.857 |
| Taylor Quarry | Feldspar | — | Past Producer | 39.718, -76.128 |
| H.Clay Whiteford and Company Quarry | Feldspar | — | Past Producer | 39.692, -76.239 |
| Devries Quarry #1 | Feldspar | — | Past Producer | 39.357, -76.907 |
| August Sandusky Quarry | Feldspar | — | Past Producer | 39.379, -76.867 |
| Fisher and Carozza Quarries | Feldspar | — | Past Producer | 39.256, -76.782 |
| Warfield Quarry | Feldspar | — | Past Producer | 39.351, -76.900 |
| Pindell Quarries No. 1 | Feldspar | — | Past Producer | 39.244, -76.761 |
| Oursler Quarry | Feldspar | — | Past Producer | 39.364, -76.894 |
| Dorseys Run Quarry No. 1 | Feldspar | — | Past Producer | 39.313, -76.829 |
| French Quarry | Feldspar | — | Past Producer | 39.353, -76.812 |
| Zepp Quarry | Feldspar | — | Past Producer | 39.346, -76.903 |
| Feeney and Atherton Co. Quarries | Feldspar | — | Past Producer | 39.314, -76.832 |
| Devries Quarry #3 | Feldspar | — | Past Producer | 39.353, -76.911 |
| Moody Quarry | Feldspar | — | Past Producer | 39.307, -76.855 |
| Pindell Quarries No. 2 | Feldspar | — | Past Producer | 39.243, -76.758 |
| Earth Products Company Quarries | Feldspar | — | Past Producer | 39.131, -76.955 |
| Wilt Quarry | Feldspar | — | Past Producer | 39.317, -76.794 |
| Hollofield Quarries | Feldspar | — | Past Producer | 39.305, -76.794 |
| Bald Friar Quarry | Feldspar | — | Past Producer | 39.702, -76.207 |
| John Wallen Quarry | Feldspar | — | Past Producer | 39.358, -76.902 |
| Biddison Pegmatite Deposit | — | — | Prospect | 39.331, -76.907 |
| Melvin Quarry | Feldspar | — | Past Producer | 39.232, -76.919 |
| Harold Stromberg Quarry | Feldspar | — | Past Producer | 39.340, -76.909 |
| Conowingo Marble and Mineral Quarry | Feldspar | — | Past Producer | 39.709, -76.187 |
| Dorseys Quarry No. 2 | Feldspar | — | Past Producer | 39.314, -76.830 |
| Streker Quarry | Feldspar | — | Past Producer | 39.301, -76.807 |
| Riley Sand Chrome Property | Chromium | — | Prospect | 39.718, -76.153 |
| East Marriottsville Quarry | Feldspar | — | Past Producer | 39.351, -76.898 |
| Arlington No. 2 Quarry | Feldspar | — | Past Producer | 39.314, -76.848 |
| Weber Quarry | Feldspar | — | Past Producer | 39.252, -76.781 |
| Dietz Quarry | Feldspar | — | Past Producer | 39.318, -76.835 |
| Weetenkamp Quarry | Feldspar | — | Past Producer | 39.356, -76.899 |
| Theis Quarry No. 1 | Feldspar | — | Past Producer | 39.313, -76.798 |
| Worth Brothers Quarry | Feldspar | — | Past Producer | 39.704, -76.194 |
| Wharton Quarry | Feldspar | — | Past Producer | 39.253, -76.777 |
| Picnic Wood Quarries | Feldspar | — | Past Producer | 39.319, -76.803 |
| Frost Quarry | Feldspar | — | Past Producer | 39.312, -76.857 |
| U.F.Peach Quarries | Feldspar | — | Past Producer | 39.335, -76.840 |
| James Peach Quarry | Feldspar | — | Past Producer | 39.331, -76.848 |
| Hanna Quarry | Feldspar | — | Past Producer | 39.344, -76.918 |
| Melvin Quarry No. 1 | Feldspar | — | Past Producer | 39.230, -76.919 |
| Gilmor Quarry | Feldspar | — | Past Producer | 39.431, -76.524 |
| Guilford and Waltersville Quarry | Feldspar | — | Past Producer | 39.328, -76.856 |
| Mathews Quarry | Feldspar | — | Past Producer | 39.336, -76.905 |
| Fagan Quarries | Feldspar | — | Past Producer | 39.306, -76.803 |
| South Granite Quarries | Feldspar | — | Past Producer | 39.333, -76.852 |
| James Peach Quarry | Feldspar | — | Past Producer | 39.330, -76.850 |
| Bald Friar Quarry #2 | Feldspar | — | Past Producer | 39.696, -76.204 |
| South Marriottsville Quarry | Feldspar | — | Past Producer | 39.349, -76.901 |
| Offutt Quarry | Feldspar | — | Past Producer | 39.352, -76.830 |
| Melvin Quarry No. 2 | Feldspar | — | Past Producer | 39.228, -76.918 |
| Theis Quarry No. 2 | Feldspar | — | Past Producer | 39.312, -76.797 |
| Alberton Quarry | Feldspar | — | Past Producer | 39.317, -76.816 |
| Caldwell Quarry Original | Feldspar | — | Past Producer | 39.700, -76.191 |
| Humphrey Quarry | Feldspar | — | Past Producer | 39.317, -76.794 |
| French Quarry | Feldspar | — | Past Producer | 39.351, -76.810 |
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