Index No: NBM057220; Collected By: ; Sample Type: hand sample; Notes: Ledge outcrop, silicified dacite porphyry, some alunite, iron and manganese oxides; iron-oxide-stained, silicified rock with alunite replacement of feldspar phenocrysts.
Summary
Index No: NBM057220; Collected By: ; Sample Type: hand sample; Notes: Ledge outcrop, silicified dacite porphyry, some alunite, iron and manganese oxides; iron-oxide-stained, silicified rock with alunite replacement of feldspar phenocrysts.