Glen Riddle, Middletown Township, Delaware Co., Pennsylvania, USA
Harmotome, as small, crusiform twins, was found in fractures in a gabbro dike intruding serpentine (Meier, 1939). The outcrop is in a railroad cut about 300 feet south of the Rt 452 overpass.
MEIER (A. E.). Association of harmotome and barium feldspar at Glen Riddle, Pennsylvania.
Amer. Min., 1939, vol. 24, pp. 540-560.
| Corundum|| Harmotome|| Hyalophane|| Orthoclase|
4 entries listed. 3 valid minerals.
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