Microlite
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Microlite was once known as a pale-yellow, reddish-brown, or black isometric mineral composed of sodium calcium tantalum oxide with a small amount of fluorine. Its chemical formula is 2Ta2O6. Today it
Harding Pegmatite Mine
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The Harding Pegmatite Mine is a former adit mine that extracted lithium, tantalum, and beryllium from a Precambrian pegmatite sill. It ceased operations in 1958 and its owner, Arthur Montgomery, donat
The Harding Pegmatite Mine is a former beryl quarry in New Mexico.
Main quarry of Harding Pegmatite Mine
Massive quartz zone of the Harding Mine showing adits
Quartz/rose muscovite zone of the Harding zoned pegmatite