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  1. Blue Mountain Granite

    ... random orientation. Maximum grain size is 2 mm (feldspar porphyroblast ), modal size covers a significant range from about .15 to .75 ...

    Ed FitzGerald - 2015-09-04

  2. Dolph Pond Granite

    ... similar physical appearance, excluding the large quartz porphyroblast s, feldspar would predominate. Feldspar twinning is not common ...

    Ed FitzGerald - 2015-09-04