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Mineral Specimens with Quartz
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4.1 x 3.7 x 2.5 cm. A "bellybutton"-shaped specimen of very softly rounded, silky-textured chalcodony, probably from one of the many roadcuts here. Completely free of matrix, this is a floater. Quite unusual, in person, it looks like it was grown from a flower and not from mineral matter. Ex. Harold Urish Collection.
4.1 x 3.8 x 2.7 cm. This specimen is a great small cabinet size piece consisting of super quality, sharp, gemmy, highly lustrous, prismatic, lilac "reverse" scepter and simple crystals of Amethyst measuring up to 1.4 cm sitting atop white/colorless, slightly modified scalenohedra of Calcite. This piece is remarkable for Bolivia as it features a type of crystallization that is virtually unheard of from Bolivia.
7.7 x 4.6 x 3.3 cm. This specimen was found about 5-6 months ago (2009), and is one of the more interesting Cassiterite association specimens that I have seen in years. Bolivia has probably produced more tin than any other country in the world. The great tin mines at Viloco (sometimes called Araca) have produced some of the most magnificent Cassiterite specimens extant. This particular specimen host of several fine, sharp, rather lustrous, black cyclic twinned crystals measuring up to 9 mm across which are associated with very eye-catching Quartz crystals that actually have small Smoky Quartz "phantoms" in the center of the prisms.
4.3 x 3.0 x 3.0 cm. A beautifully sharp, textbook fluorite octahedron strikingly impaled on a quartz crystal. All of the crystal faces, except for one unique, narrow face, are lightly frosted on this water-clear, colorless beauty. Classic and very choice material from the famous mines at Naica, Mexico and the Jaime Bird Collection.
6.2 x 6.0 x 5.1 cm. A very aesthetic cluster of three Japan-law twin quartz crystals from recent finds in Peru. The three, intergrown twins have a very nice sculptural aspect, and look good from all sides. The lustrous, flattened, tabular crystals are lightly frosted, have interesting beveled edges and some crystal faces are nicely striated. The twins rest on a bed of quartz points on matrix. I particularly like the way the largest twin in the middle is at an opposing angle to the other two twins and separates them. An excellent multiple twin Peru quartz specimen.
8.3 x 7.2 x 6.8 cm. Russian citrine specimens are very difficult to come by. This is a dramatic and beautiful, two crystal specimen. The crystals are very gemmy, with the beautiful and distinctive acid-yellow color peculiar to the best Russian citrines. The tiny, colorless crystals embedded in the sides are a fine accent. The piece sits attractively on a natural quartz "base". From a find of 2-3 years ago (2006-2007).
4.4 x 2.7 x 2.0 cm. This is an extremely rare doubly terminated quartz crystal with light brown tremolite (asbestos) inclusions from a unique 1956 find at the famous Crystal Peak quartz locality in La Paz County, Arizona. Faint fibers to about 1.0 cm are visible with strong backlighting within the very showy pair of lustrous, translucent, quartz crystals. The terminations at either end are very distinctively different. An ultimate Arizona rarity I first learned about seeing a famous old piece from the John Sinkankas Collection, that was similar, years ago. You can read more about this unique find at Bill Larsons Pala Gems website link: http://www.palagems.com/mineral_news_2008_v2.htm.
6.7 x 5.1 x 4.5 cm. An interesting and very showy pseudomorph from recent finds at the Shangbao Mine of China. Sparkly, drusy quartz has pseudomorphed sharp calcite scalenohedrons on this excellent, damage-free specimen. The large pseudomorph is 4.7 cm and you can see where this and another crystal have been partially dissolved away and then pseudomorphed. Fascinating. Furthermore, the drusy quartz-covered base is sea-green fluorite.
6.5 x 5.6 x 4.2 cm. A gorgeous spray of lightly frosted quartz crystals is very aesthetically perched on lustrous, jet-black sphalerite crystals on this fine combination piece from Naica, Mexico and the Jaime Bird Collection. Jaime bought this piece in 1975. Classic Naica material.
7.8 x 3.2 x 2.4 cm. A superb amethyst with movable bubble from Namibia. The crystal has incredible clarity, sharpness and striking purple color saturation. The chevron form of the amethyst color is striking in the side view. This complete-all-around crystal is pristine. The large, easily seen movable bubble has a travel distance of nearly a centimeter. The window in the front to the interior colorless area is also noteworthy.
1.6 x 1.5 x 0.8 cm. A superb gold on quartz thumbnail from the Eagle’s Nest Mine. Very bright, rich yellow gold crystals as elongated spinel-twins and smaller hoppered octahedrons comprise this very aesthetic piece. The sculptural gold looks just like a stylized praying mantis to me.
7.4 x 4.5 x 3.9 cm. Brilliant, beautiful needles of turquoise-blue brochantite richly and aesthetically cover the sculptural quartz matrix on this outstanding older specimen from the Blanchard Mine. Most Blanchard brochantite is a much darker green, so this is an uncommonly fine piece from Dennis Mullane Collection.
7.2 x 5.0 x 4.4 cm. A truly exceptional and aesthetic cluster of Herkimer quartz "diamonds". The fabulous, facet-like, 5.0 cm "diamond" has incredible clarity and amazing internal patterns. The crystal gives beautiful internal rainbow refractions, as the photo highlights. The smaller "diamonds" attached to the side look just like jewels. The super diamond rests on a base of very glassy, but more translucent quartz crystals, really setting off the "crown jewel". This is a superb, complete-all-around and pristine specimen. Ex. Leithauser Collection.
5.4 x 4.4 x 2.6 cm. A superb, old-time, doubly terminated, twinned cassiterite crystal from the ancient mines at Schlaggenwald, Bohemia. This very large and sharp, lustrous, dark gray crystal has textbook crystal form and is very nicely accented by a single quartz point. Seldom available in this size and quality from this historic locale and comes with an old handwritten label in English. Ex. Richard Hauck Collection.
5.4 x 5.3 x 4.9 cm. A really fine and aesthetic specimen from recent finds at Irai, Brazil. A beautiful, intergrown cluster of colorless calcite scalenohedrons is dramatically perched atop a pineapple cluster of amethyst crystals. This complete-all-around piece is nearly pristine.
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Rob Lavinsky, rob@irocks.com
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share specimen![Quartz (Var: Chalcedony) from Arivaca, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA [db_pics/mdpics/MD-247924a.jpg]](db_pics/mdpics/MD-247924a.jpg)
![Quartz (Var: Amethyst) from Bombori, Chayanta Province, Potosà Department, Bolivia [db_pics/mdpics/MD-249058a.jpg]](db_pics/mdpics/MD-249058a.jpg)
![Quartz (Var: Amethyst) from Bombori, Chayanta Province, Potosà Department, Bolivia [db_pics/mdpics/MD-249058b.jpg]](db_pics/mdpics/MD-249058b.jpg)
![Cassiterite, Quartz from Viloco Mine (Araca mine), Loayza Province, La Paz Department, Bolivia [db_pics/mdpics/MD-249060a.jpg]](db_pics/mdpics/MD-249060a.jpg)
![Cassiterite, Quartz from Viloco Mine (Araca mine), Loayza Province, La Paz Department, Bolivia [db_pics/mdpics/MD-249060b.jpg]](db_pics/mdpics/MD-249060b.jpg)
![Fluorite, Quartz from Naica, Mun. de Saucillo, Chihuahua, Mexico [db_pics/mdpics/MD-249081a.jpg]](db_pics/mdpics/MD-249081a.jpg)
![Quartz from Rosario Mabel claim (Flor de Peru II claim), Pampa Blanca, Castrovirreyna District, Castrovirreyna Province, Huancavelica Department, Peru [db_pics/mdpics/MD-249082a.jpg]](db_pics/mdpics/MD-249082a.jpg)
![Quartz from Rosario Mabel claim (Flor de Peru II claim), Pampa Blanca, Castrovirreyna District, Castrovirreyna Province, Huancavelica Department, Peru [db_pics/mdpics/MD-249082b.jpg]](db_pics/mdpics/MD-249082b.jpg)
![Quartz (Var: Citrine) from Olkhovka, Tyumenskaya Oblast', Polar Urals, Western-Siberian Region, Russia [db_pics/mdpics/MD-249085a.jpg]](db_pics/mdpics/MD-249085a.jpg)
![Quartz, Tremolite from http://www.palagems.com/mineral_news_2008_v2.htm. [db_pics/mdpics/MD-249183a.jpg]](db_pics/mdpics/MD-249183a.jpg)
![Quartz, Calcite, Fluorite from Shangbao Pyrite mine, Leiyang Co., Hengyang Prefecture, Hunan Province, China [db_pics/mdpics/MD-249187a.jpg]](db_pics/mdpics/MD-249187a.jpg)
![Quartz, Sphalerite from Naica, Mun. de Saucillo, Chihuahua, Mexico [db_pics/mdpics/MD-249193a.jpg]](db_pics/mdpics/MD-249193a.jpg)
![Quartz (Var: Amethyst) from Goboboseb Mountains, Brandberg area, Brandberg District, Erongo Region, Namibia [db_pics/mdpics/MD-249205a.jpg]](db_pics/mdpics/MD-249205a.jpg)
![Quartz (Var: Amethyst) from Goboboseb Mountains, Brandberg area, Brandberg District, Erongo Region, Namibia [db_pics/mdpics/MD-249205b.jpg]](db_pics/mdpics/MD-249205b.jpg)
![Gold, Quartz from Eagle's Nest Mine (Mystery Wind Mine), Placer Co., California, USA [db_pics/mdpics/MD-249207a.jpg]](db_pics/mdpics/MD-249207a.jpg)
![Brochantite, Quartz from Blanchard Mine (Portalas-Blanchard Mine), Bingham, Hansonburg District, Socorro Co., New Mexico, USA [db_pics/mdpics/MD-249208a.jpg]](db_pics/mdpics/MD-249208a.jpg)
![Brochantite, Quartz from Blanchard Mine (Portalas-Blanchard Mine), Bingham, Hansonburg District, Socorro Co., New Mexico, USA [db_pics/mdpics/MD-249208b.jpg]](db_pics/mdpics/MD-249208b.jpg)
![Quartz (Var: Herkimer Diamond) from Ace of Diamonds Mine, Middleville, Town of Newport, Herkimer Co., New York, USA [db_pics/mdpics/MD-249221a.jpg]](db_pics/mdpics/MD-249221a.jpg)
![Cassiterite, Quartz from Hornà Slavkov (Schlaggenwald), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic [db_pics/mdpics/MD-249227a.jpg]](db_pics/mdpics/MD-249227a.jpg)
![Cassiterite, Quartz from Hornà Slavkov (Schlaggenwald), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic [db_pics/mdpics/MD-249227b.jpg]](db_pics/mdpics/MD-249227b.jpg)
![Calcite, Quartz (Var: Amethyst) from IraÃ, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil [db_pics/mdpics/MD-249229a.jpg]](db_pics/mdpics/MD-249229a.jpg)
![Calcite, Quartz (Var: Amethyst) from IraÃ, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil [db_pics/mdpics/MD-249229b.jpg]](db_pics/mdpics/MD-249229b.jpg)