Riebeckite is a rare (though locally abundant) mineral at MSH, found only in the marble xenoliths and hornfels. A lot of it is rather ugly because the fibers mat together and get full of dirt when exposed to the rain – as is the usual case. This is a relatively small, but exceptionally attractive, example from a marble xenolith.

The first pair of photos (FOV 4.2 x 6.35 mm) shows pale blue,“curly-haired”, “pom-poms” ca 3.2 mm in diameter.

The second pair of photos (FOV ca 9 x 15 mm) is a broader view.

The next photo (FOV 5.7 x 4.5 mm) is another close-up view.

Single item shipping weight (with TN case) is 3.2 oz (91 g). For shipments outside the USA, up to a total weight < 8 oz (225g), this can be combined with items from this or other auctions for the same postage.

Within the USA, postage for total weights up to 13 oz ranges from $4.25 to $6.50 (including packing etc) regardless of destination. Above 13 oz, I will use “own box” Priority Mail. The rate, including packing, varies by destination from $7.25 to $9.50.

See my updated “Shipping Policy” for details.