Originally Posted by
Barb T.
Ummm, ahhh, it's geological shorthand for a rock containing the minerals quartz, feldspar, and hornblende or quartz, feldspar, and biotite. The quartz and feldspar are light-colored and the hornblende and biotite are black, so, if they're in a rock together, they give it a kind of salt-and-pepper look. Kind of like the Highland Granite tartan. More than you wanted to know, no doubt!!
Barb
Not only can you learn all about kilts and tartans here on the boards, you can get a geology lesson as well!!
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