<- Graphite mineral , it can turn from black to grey, used to make pencil lead, and its streak is black and has greasy texture .
<- Talc mineral, it can turn from green to white, used to make ceramic paper, and its streak is white-ish and also has greasy texture
Thursday, October 25, 2012
Mineral properties Vocabulay
Tuesday, October 23, 2012
Sunday, October 14, 2012
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