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Mineral Specimens with Thomsonite-Ca
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5.0 x 3.6 x 2.2 cm. Colorful, well-developed spheroids of pastel-orange, bladed thomsonite attractively cover the mounded matrix of sharp, glassy, colorless analcime crystals on this fine combination zeolite specimen from the Skookumchuck Dam locality of Washington. Crystallized thomsonite is rare from any locality compared to other zeolite species. Ex. Rice NW Museum Collection.
6.0 x 4.3 x 2.3 cm. Colorful, well-developed spheroids to 1.6 cm of pastel-orange, bladed thomsonite attractively cover the mounded matrix of sharp, glassy, colorless analcime crystals on this fine combination zeolite specimen from the well-known Skookumchuck Dam locality of Washington. Ex. Rice NW Museum Collection.
6.2 x 4.4 x 4.0 cm. Schorlomite is a rare garnet species and thomsonite is a relatively uncommon zeolite group mineral. The famous Magnet Cove deposit is the Type Locality for schorlomite. This old-time specimen is essentially solid intergrown, blackish-brown schorlomite crystals. The crystals are euhedral to subhedral and the large crystal on top is 4.5 cm. Some crystal faces are very sharp, highly lustrous and are very well-striated. Little pods of cream-colored, lustrous and translucent lathes of thomsonite are scattered about. This is old-time material, probably around 100 years old, as there is a cloth label glued to the bottom of the piece. Ex. Mullane Collection.
6.6 x 5.0 x 4.5 cm. Thomsonite is one of the less common members of the zeolite family. In this case, it has grown as a large, ivory-colored crystal aggregate, measuring 6.5 cm across. It has formed on an earlier generation of green prehnite, to 1.5 cm across.
15.7 x 10.5 x 6.2 cm
8.3 x 6.6 x 5.6 cm
A big, rich and rare American specimen - an intact pocket of hairlike acicular crystals of mesolite growing off balls of thomsonite (both minerals are hydrated sodium calcium aluminum silicate) from Oregon. This is another unique and hard-to-obtain piece that came out of the noted Hauck Collection. Not something you see around on the market, to be sure! 13.3 x 11.2 x 7.8cm
A DRAMATIC and SUPERB CABINET specimen of lustrous, pearlescent mesolite needles to 4.5 cm artistically set in a thompsonite-covered vug in basalt matrix from the famous, but relatively unknown Jaquish Road Cut at Goble, Oregon. This is one of the finer United States mesolite specimens, that you will ever see. Choice material from the Richard Hauck Collection. 10.4 x 6.0 x 5.7 cm
A STRIKING buffed specimen of a 1.6 cm, banded, birds-eye, thomsonite-lintonite nodule nicely set in amygdaloidal matrix from the Grand Marais on the North Shore of Lake Superior, Minnesota. Thomsonite and lintonite are zeolites. Ex Richard Hauck Collection. 4.4 x 3.0 x 2.4 cm
There has recently been some new finds of the relatively rare Zeolite species Thomsonite in India. Most people are probably familiar with the rather smooth spheres that came on the black basalt matrix last year. This is a great association specimen from the same locality featuring a great, large sphere of Thomsonite measuring 3.2 cm sitting on half of a "bow tie" of lustrous, pink Stilbite. A beautiful association piece of one of the rarer Zeolite species out there. 7.3 x 4.4 x 3.2cm
At first, nobody could believe these were thomsonites when they appeared at the Tucson show earlier this year – they were being sold as something else until “the” expert on zeolites identified them for what they were right there at the show – the biggest and richest thomsonites the world has ever seen! Then there was a mad rush to buy them, of course. This specimen features three interconnected balls, the standard form for this important find. 5.2 x 3.4 x 2.5cm
A STRIKING buffed and sawed specimen of a 2.3 cm, banded, birds-eye, thomsonite-lintonite nodule nicely set in amygdaloidal matrix from the Grand Marais on the North Shore of Lake Superior, Minnesota. Thomsonite and lintonite are zeolites. Ex Richard Hauck Collection. 3.6 x 3.6 x 2.8 cm
6.3 x 3.7 x 3.2 cm. A beautiful and showy 3.7 cm vug lined with complexly crystallized, lustrous, translucent and colorless thomsonite and analcime crystals set in matrix from Flinders, Victoria, Australia.
At first, nobody could believe these were thomsonites when they appeared at the Tucson show earlier this year – they were being sold as something else until “the” expert on zeolites identified them for what they were right there at the show – the biggest and richest thomsonites the world has ever seen! Then there was a mad rush to buy them, of course. Not all are so beautiful, but a few have the gorgeous aesthetics of this one, with a huge, perfect ball measuring 4 cm centered on the sparing matrix, surrounded by smaller balls. 9 x 6.5 x 2.8 cm
8.0 x 6.0 x 4.2 cm. Beautiful, salmon-colored, elongated crystals of thomsonite in a natural geode from this classic Alpine locality. This is from the collection of Phil Scalisi, exchanged to him from Harvard over 20 years ago. These crystals are quite large by any standard, alpine or otherwise.
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Rob Lavinsky, rob@irocks.com
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