CHAPTER II.
DIRECTIONS FOR DETERMINING SPECIMENS BY THE KEY.--How to
Test Minerals with the Simplest Means--Prospecting with a Jack-knife
and Common Sense--Use of the Key--How to Tell Pyrites from Gold, and
Quartz from Diamond--All the Useful Minerals Grouped According to
Hardness and Color.....15
Underground Treasures: How and Where to Find Them A Key for the Ready Determination of All the Useful Minerals Within the United States · 第 2 / 9 章