GRANTS.ROCKS

Rocks I've Found on the Beach

A catalog of rocks, minerals, and agates I have collected and identified.

Garnet-bearing Gneiss

Garnet-bearing Gneiss

Biotite gneiss containing garnet, collected along Lake Michigan's shore.

  • Metamorphic
  • Garnet
  • Gneiss
  • Lake Michigan
Jacobsville Sandstone

Jacobsville Sandstone

Jacobsville Sandstone, similar to the sandstone seen at Pictured Rocks National Lakeshore, collected along Lake Superior's shore.

  • Neoproterozoic
  • Sandstone
  • Sedimentary
  • Lake Superior
Chalcedony Nodule

Chalcedony Nodule

Chalcedony nodule with slight pink hue, collected along Lake Michigan's shore.

  • Chalcedony
  • Nodule
  • Silica
  • Lake Michigan
Silicified Sedimentary Rock

Silicified Sedimentary Rock

Some type of sedimentary rock, heavily silicified, collected along Lake Michigan's shore.

  • Silicified
  • Lake Michigan
  • Sedimentary
Greenschist

Greenschist

Banded greenschist, collected along Lake Superior's shore.

  • Metamorphic
  • Greenschist
  • Lake Superior
Pudding Stone

Pudding Stone

Small pudding stone, collected along Lake Michigan's shore.

  • Metamorphic
  • Conglomerate
  • Puddingstone
  • Quartzite
  • Lake Michigan
Augen Gneiss

Augen Gneiss

Augen gneiss with feldspar eyes, collected along Lake Michigan's shore.

  • Metamorphic
  • Gneiss
  • Feldspar
  • Lake Michigan
Septarian Nodule

Septarian Nodule

Septarian nodule or "lightning stone," collected on Lake Michigan's shore.

  • Sedimentary
  • Quartz
  • Calcite
  • Lake Michigan