Where mica has been recorded in New Jersey

Found alongside

• Mica

  Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat

  40 sites

• Magnetite

  Mohs 5.5–6.5. Black and strongly magnetic. Mindat

  35 sites

• Pyrite

  Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat

  14 sites

• Feldspar

  Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat

  9 sites

• Quartz

  Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat

  6 sites

• Garnet

  Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat

  3 sites

Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.

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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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 October 2026