Kaolin (China clay).
A. K. Madan has written: 'Problems, progress & prospects of mineral production' -- subject(s): Mineral industries
Anil K Ghosh has written: 'Mineral wealth of the ocean' -- subject(s): Mines and mineral resources, Ocean mining, Marine mineral resources
Potassium
James K. Crook has written: 'The mineral waters of the United States and their therapeutic uses' -- subject(s): Accessible book, Mineral waters, Mineral Waters
Alfred K Snelgrove has written: 'Mines and mineral resources of Newfoundland' -- subject(s): Mines and mineral resources
Feldspar
Feldspar
K. D Kelley has written: 'The Alaska mineral resource assessment program' -- subject(s): Mines and mineral resources
R. K. Sinha has written: 'A treatise on industrial minerals of India' -- subject(s): Mines and mineral resources, Mineral industries
Eileen K. Peterson has written: 'The Mineral Industry of Wyoming'
Some words that start and end with the letter K are:kayakkickkinfolkkinkkioskknackknapsackknock
Opal is a mineral.