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Superb, rare combination specimen of mimetite, azurite and wulfenite. The mimetite measures to 1.9 cm. From my personal collection. 9.4 x 4.5 x 2.5 cm.
Nice older, small cabinet specimen of these three calcium silicates. The inesite has a good salmon-pink color and measures to 5 mm. The datolite crystals are lustrous and measure to about 5 mm; some have a pinkish color probably due to included inesite. The white xonotlite balls measure to about 8 mm and are in relatively good shape for the species. The xonotlite fluoresces a bluish-white under LW UV. 5.8 x 5.4 x 4.2 cm.
Superb miniature from the very small March 2000 find of orange prehnite. Accompanied by white xonotlite, tabular hydroxyapophyllite and small clear datolite crystals. From my personal collection. 4.9 x 3.4 x 2.9 cm.
Superb, robust reticulated "snowflake" twin of cerussite with a secondary generation of untwinned cerussite. The color and luster are excellent, without the yellow coloration most display. Additionally, the crystallization is very robust, unlike the fragility of most similar specimens. 7.8 x 6.8 x 3.3 cm.
Excellent combination specimen of well-crystallized graphite, diopside, and fluorapatite from Block D, Merelani. The light green diopside, which measures to 1.1 cm, is well-crystallized and gemmy. The two small apatite crystals, which measure to just over 2 mm, beautifully show the dichroism common from this mine; as shown in picture 5, the apatite is blue when viewed down the c-axis and colorless when viewed perpendicular to it. The apatite is fluorescent. 6.2 x 4.3 x 2.3 cm.
From the type locality, this is an extremely rare gem floater crystal of axinite-(Mg) (magnesioaxinite). The crystal is color-zoned from clear to pale salmon, has a superb vitreous luster, and has a sharp form. It fluoresces red to violet under LW UV. Figured in the Merelani issue of the Mineralogical Record. 3.3 x 2.2 x 0.5 cm.
Large, beautiful pseudomorph of malachite after azurite from Onganja. The malachite is well crystallized in velvety sprays, as can be seen in the close-up. The large crystal at the top is 6.0 cm long. 6.9 x 6.9 x 5.6 cm.
Superb, brightly colored specimen from the best locality (in my opinion) for cobaltoan calcite. The dark heterogenite and white calcite provide an excellent color contrast. 5.1 x 4.4 x 2.8 cm.
Nice 1.2 cm, complex, lustrous crystal of this rare sulfide mineral. The additional smaller crystals are mostly quite nice as well, although there is some scattered contacts and minor damage as shown in the photos. 7.7 x 6.7 x 5.0 cm.
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