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Mineral Specimens with Calcite
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6.9 x 4.9 x 4.9 cm. A superb example of the unique find in China maybe a year and a half ago of glittering, golden pyrite selectively deposited on the edges of large calcite crystals. Sometimes the coverage of pyrite is not so good, but here you see a rich mat of it along all the crystals edges.
4.9 x 3.9 x 3.4 cm. A fine specimen of the sought-after bright pink cobaltoan variety of calcite, which has come out of Bou Azzer in good specimens over the past 3 years. Here you have chunky crystals to one centimeter, saturated with wonderful pink.
4.9 x 4.1 x 2.9 cm. This specimen is incredibly flashy, because both the galena crystals and pyrite crystals have this mirror-metallic bright luster. There are some pretty little modified rhombohedrons of translucent calcite as an accent.
8.4 x 7.4 x 6.4 cm. A beautiful bloom of cave-formation calcite from Bisbee - another piece from the Dave Stoudt collection. Starting from a thin stalk at the bottom, it branches out an in a cluster of flattened rhombs, which in turn are capped by snowball rosettes! Classic material.
12.4 x 10.2 x 8.9 cm. The Wein Collection, which was dispersed about 4 years ago, contained all sorts of rare and unusual Swiss and Alpine specimens. Here is another - a large, egg-shaped geode full of prehnite and calcite. The prehnite is in colorless to very faintly green balls, and the calcite, in little rhombs. Unuusal locality piece!
11.9 x 9.6 x 4.4 cm. A striking Sweetwater specimen for many reasons. One, the golden calcite is complete, pristine, doubly-terminated and sits perfectly upright and fully exposed on the matrix. For another, it has this sharply-defined phantom inside, the front face of the inner crystal having been coated with a dark mineral so it really stands out. The calcite measures 8 cm. Showy and wonderful! Ex. George Feist collection.
9.7 x 8.6 x 6.4 cm. A showy and excellent pseudomorph from recent finds at the famous Xianghualing Mine of China. Snow-white, sparkly quartz after calcite scalenohedrons are richly encrusted on glassy, translucent, sea-green fluorite. A few broken pseudos show that the crystals are hollow! This is indeed, a neat revelation, highlighting the pseudomorphing process of the calcite crystals by the quartz.
6.8 x 4.2 x 3.8 cm. Here we have an eye-catching, sharp, lustrous, gemmy, fiery cherry-red color prismatic Realgar crystal which is aesthetically sitting along the side of a well-formed, lustrous, grey Calcite scalenohedron. I have not seen many Realgar specimens with isolated crystals like this one.
5.5 x 4 x 2.25 cm. CLASSIC ruby silver, mined in the late 1800s in Chanarcillo! A very showy specimen showcasing rare individualized crystals of proustite on matrix, in itself also rare as most are on massive lumpy proustite. Here we have real matrix of calcite crystals and rock. This specimen, with crystals to 1.5 cm, is beautiful from both sides. The proustite has great color and lustre.
7.1 x 4.6 x 4.2 cm. This is a very dramatic piece with a central emerald flanked by "wings" of crystallized calcite. The 2.8-cm-tall emerald is of top color and glassy lustre, and is very large for such a specimen. It is entirely transparent throughout, though with internal veils as usual in a specimen. You can see right through it to the underlying matrix!
18.5 x 15.0 x 11.8 cm. An astonishingly good copper by ANY standard, this is also one of unique historical import: according to several people whom I consulted it should be one of the finest surviving early copper country coppers that is well-documented. It is certainly the best known from this old mine. It is a beautiful specimen with a natural old patina, and sharp crystals of several habits accented by calcite. The documentation is ironclad, between the Mine Company presentation label, the old Academy display label, and the labels glued to the specimen. Ex. Philadelphia Academy of Natural Sciences.
6.8 x 6.2 x 4.0 cm. A gorgeous small cab specimen featuring the very rare and desirable association of intense gemmy green emeralds on the black calcite, which enhances the green hue of the emeralds visually! The emeralds measure about 1.5 cm each and have not only top color, but a glassy lustre that is off the charts. They are solidly anchored in the calcite, and fully terminated. Ed had very few gem crystals, and favored beryls - this was one of just 3 emeralds in the collection, and was purchased by him in 1997. Ex. Dr. Edward David, Russell Behnke Collections.
12.4 x 10.7 x 6.1 cm. This is a massively large dioptase specimen to be in such good condition, almost 5 inches across and with dozens of crystals that are almost pristine with just a few teeny dings or damaged spots of no significance. It is the most desirable style in that they diops are both isolated and on white calcite. Moreover, the calcite is crystallized and not just druse. To make this really top, it does have the absolutely highest lustre you could ask for. The crystals are even translucent when backlit.
9.5 x 5.5 x 3.5 cm. Dioptase crystals to 2 cm on calcite matrix! Ex. Dr. Edward David Collection.
17.8 x 13.0 x 3.9 cm. A plate of super-sparkly rhombs of gemmy calcite, made extra-beautiful by inclusions of malachite that turn them a pretty grass green color! A large, flashy and showy specimen from the world’s greatest mineral locality.
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Rob Lavinsky, rob@irocks.com
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share specimen![Pyrite, Calcite from Chenzhong (?), Hunan Province, China [db_pics/mdpics/MD-163749a.jpg]](db_pics/mdpics/MD-163749a.jpg)
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