Chapter VII: The Fertilizer Group of Minerals 99

GENERAL COMMENTS 99

NITRATES 101
Economic features 101
Geologic features 102

PHOSPHATES 104
Economic features 104
Geologic features 105

PYRITE 107
Economic features 107
Geologic features 108

SULPHUR 109
Economic features 109
Geologic features 110

POTASH 111
Economic features 111
Geologic features 112