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Mineral Specimens with Enargite
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8.4 x 6.3 x 5.7 cm. A druse of snow white, quartz crystals is the matrix for color contrasting, splendent, battleship gray, short prismatic, striated, crystals of enargite. The largest enargite crystals reach .7 cm across. A few crystals are even doubly terminated. The contrast is striking between the lustrous enargite an dthe beautiful underelaying quartz! Collected at least 50 years ago. Tim Blackwood Collection.
5.2 x 3.5 x 2.5 cm. One of the rare copper species, luzonite is especially desirable from this now defunct quarry in Taiwan, where it has replaced enargite to make these big, chunky crystals. Ex. Martin Zinn Collection.
4.8 x 4.5 x 2.5 cm. A superb pseudomorph of lustrous metallic Luzonite after Enargite. The crystal clusters are oval and up to 1.5 cm long, with sharp individual crystals along the clusters up to several mm on edge. Ex. Charlie Key.
7.2 x 4.9 x 2.4 cm. A classic American specimen. It is actually a nice piece, with robust, classic dark black crystals and minor pyrite in association.
3.3 x 3.2 x 3.0 cm. A superb pseudomorph of a sharp, euhedral, 2.0 cm, "tower" of tennantite after enargite from the Herminia Mine of the well-known Julcani District of Peru. The greenish tower stands "guard" over a matrix richly sprinkled with lightly iridescent pyritohedrons and nicely accented with dense patches of second-generation, sparkly, brass-yellow pyrite microcrystals.
5.9 x 4.6 x 4.4 cm. A hefty piece of, basically, ore. It has a pocket with a few very sharp crystals of enargite of unusual form, mistaken once for luzonite. Ex. Philadelphia Academy of Sciences Collection.
7.4 x 7.1 x 6.5 cm. This is a classic pseudomorph from a well-known locality that has produced the best examples of Luzonite. The enargite here is being replaced by luzonite, is probably mostly replaced - but I do not think the replacement is 100% yet because of the general look of it. I could be wrong, and I cannot pin why I feel this way, but it just seems off in color or lustre, to me, compared to the full luzonite pseudomorphs I have seen in the past. Perhaps it is caught in transition, partly each species. Rarely do you see these specimens on matrix and here we have it on both pyrite and host rock matrix. A fine old classic from a now defunct locale. Ex. Charlie Key.
3.5 x 3.4 x 1.5 cm. A less commonly seen Enargite specimen featuring relatively sharp, grayish-black orthorhombic crystals. The crystals appear to be growing on top of micro Pyrite matrix. Ex. Rob Smith Collection.
2.2 x 1.1 x 0.5 cm. A sharp, lustrous, complete all-around, parallel-growth enargite crystal from an uncommon worldwide locality in Taiwan. This old, copper-gold mine is now extinct. Rarely available. Ex. Jaime Bird Collection.
8.4 x 5.8 x 3.8 cm. A fine pseudomorph of Tennantite after Enargite. Here you have two large bladed crystals altered, the largest of which is 3.5 x 2.5 cm. There are several smaller crystals, as well. The pseudomorphs are lustrous and well-defined. Ex. Charlie Key Collection.
8.4 x 6.5 x 3.7 cm. An attractive quartz cluster, unusual for the locality actually, with little enargite and bornite crystals, and some overgrown pyrite underneath. Classic combination for the locale. Ex. Harold Urish Collection.
8.8 x 7.5 x 6.5 cm. A fine, double pseudomorph from the Julcani District of Peru. The form and color of this piece are unreal. Splendent, specular, brass-yellow, botryoidal pyrite has casted tennantite, which in turn have pseudomorphed large, sharp, upright enargite crystals. The amazing 3-dimensionality of the large, isolated, bulbous pseudomorphs in the front and the couple of quartz crystals really highlight this specimen. The large pseudomorph in front is 3.5 cm high. Pieces of this quality came out in the heyday of this district, in the 1970s and 80s. Ex. Jaime Bird Collection.
5.5 x 5.3 x 4.1 cm. An exceptional specimen of Enargite altering to Luzonite. The black blades of Enargite, which can reach 1.1 cm in length, have excellent luster, and the striations on the faces add greatly to the aesthetics. The Luzonite is growing on the terminations of many of the crystals of Enargite. The Enargites surround a bed of beautiful lustrous Pyrites. Ex. Charlie Key.
1.8 x 1.7 x 0.9 cm. Enargite is a signature mineral species from the Butte District. A tabular, lustrous and striated enargite crystal is nicely set amidst mirror-bright, brass-yellow pyrite crystals on this excellent, old-time, combination thumbnail. Ex. Jaime Bird Collection. Classic material.
2.6 x 2.4 x 1.3 cm. Butte enargites are probably the finest on earth. This outstanding, pristine thumbnail crystal has sharp, textbook crystal form, along with being beautifully striated with metallic-gray lustre. Classic, old-time material from the West Colusa Mine. Ex. Harvard, Scalisi, and George Feist (#2494) Collections.
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Rob Lavinsky, rob@irocks.com
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