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Llínea 18: |
| == Referències == | | == Referències == |
| <references/> | | <references/> |
| + | |
| + | == Bibliografia == |
| + | * Busbey, A.B.; Coenraads, R.E.; Roots, D.; Willis, P. (2007). Rocks and Fossils. San Francisco: Fog City Press. ISBN 978-1-74089-632-0 |
| + | * Chesterman, C.W.; Lowe, K.E. (2008). Field guide to North American rocks and minerals. Toronto: Random House of Canada. ISBN 0-394-50269-8 |
| + | / Dyar, M.D.; Gunter, M.E. (2008). Mineralogy and Optical Mineralogy. Chantilly, Virginia: Mineralogical Society of America. ISBN 978-0-939950-81-2 |
| | | |
| == Enllaços externs == | | == Enllaços externs == |