Verhniy mine, Dalngorsk
Primorsky Kray, Far Eastern Region,
6.5 x 6.3 x 4.4 CM (cabinet)
Post Tucson 2015
An attractive, fine specimen of older Dalngorsk Datolites. Transparent lustrous crystals with orange-brown phantoms in greenish prisms cover the matrix in an esthetic arrangement. Individual crystals are up to 2.9 CM, this sort of Datolite was rare when first found, and has not been available for several year.
San Luis Potosi,
6.4 x 6 x 3 CM (cabinet)
pre Tucson 2015 update
Great color and luster, this is a Datolite from Mexico that looks much more like a good Russian specimen. From a small find in late 2013, this has the form, clarity and quality of the top few percent. Some edge chipping/ contacts is inevitable but overall in very good condition.
A classic old locality! This is quite a nice and rare combo, from the Lane Quarry in Massachusetts. Cut and rough combo with a fine faceted stone of light yellow color and excellent clarity. Datolite is a rare gemstone and it is difficult to cut as the hardness varies in different orientations, but when done well they are brilliant! Datolites can have a dispersion greater than diamond. The crystal is bright, sharp and un-dinged on the display side, contacted on back and broken on the base, it displays well. Very uncommon to see a Massachusetts Datolite combo like this!
Impressive and a Northeastern US classic! Sharp, clear and bright gemmy Datolites up to 2.4 CM with selective faces colored a nice cognac hue sit on a contrasting green Prehnite. As esthetic as you can find, the main crystals are in perfect condition but non detracting damage is noted on a few smaller crystals and at the edges. Despite this it displays very well and is a striking specimen from this old locale.
Datolite-color change & Heulandite
Prospect Park Quarry, Patterson, Passaic County
5.0 x 3.1 CM (miniature)
The yellow to green color change occurs between incandescent, flourescent and daylight. Lusterous crystals the largest measuring 2.9 CM with contact on the bottom of the crystal. From a 2009 find.