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Mineral Specimens with Corundum
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2.8 x 2.0 x 2.0 cm. This is a superb thumbnail specimen. A bit of matrix is host for 2 crystals of lustrous and translucent, cherry red ruby with exquisite micro-details on the faces and sharp beveled edges. The larger one, exhibiting superb crystal form, measures 1.5 cm across. These ruby crystals are totally unique in form, and combined with color and gemminess make for a dramatic matrix presentation that is unlike rubies from any other locality in the world.
6.1 x 4.8 x 4.5 cm. Nestled in a vug of massive corundum is a lustrous and translucent, lavender to rose red colored ruby crystal, measuring 2.2 cm in length. This is a large, well-defined crystal of unusual size for this locality. There is a slight internal gradation to sapphire, visible when backlit. In normal lighting, it is a much more typical ruby color, at least on the surface zones. The presentation of the crystal in matrix is more typical of other matrix gem crystals compared to the generally smaller examples we are otherwise seeing from this deposit.
6.4 x 5.9 x 4.0 cm. A large piece: the matrix is composed primarily of massive corundum, and host to a few lustrous and translucent crystals, of lavender to rose-red ruby/sapphire. The large crystal is doubly terminated and measures 3.0 cm across. There is a negative impression on the back of the main crystal where another ruby was once in contact but the display face presents nicely.
6.3 x 4.5 x 4.0 cm. This is a major matrix piece for the discovery, to date. Aesthetically perched high on its matrix is a doubly terminated, lustrous and translucent, cherry red crystal of ruby, measuring 2.2 cm in length. Very nice form and sharpness make it stand out dramatically. This crystal is unlike most others from here, very well formed. Compared to other locales, these rubies are sharper with better defined faces, than you normally see in a natural crystal.
2.3 x 1.4 x 1.3 cm. This specimen literally hosts a "jewel" atop. The dominant crystal is a well terminated, glassy and gemmy, purplish to rose-red crystal that looks faceted. It is lustrous and sharp all around. In fact, the very tip of the crystal is facet quality. 29.8 carats.
1.3 x 1.3 x 1.1 cm. This is a rather equant, glassy and gemmy, rose to cherry red, doubly terminated, ruby crystal. The color is very close to the pigeon’s blood red, found in rubies. Only contacted at the bottom. This is a superb loose ruby crystal of really quite good lustre and form compared to rubies from any other locality. For this particular deposit, it is more pure red, and more gemmy, than most crystals of this size. 25 carats.
2.0 x 1.3 x 1.2 cm. This lustrous and gemmy, lavender colored crystal is also doubly terminated. The color is oddly zoned between part sapphire and part ruby; and in particular more purplish under fluorescent lights and more reddish in sunlight. There is a significant amount of medium-purple colored cutting rough inside this crystal. 33.3 carats.
1.1 x 0.9 x 0.7 cm. This is an extraordinarily glassy and gemmy, rose-cherry-red crystal of ruby. It is also doubly terminated and nearly complete all around, only with minor contact on the back side. 5.4 carats.
3.4 x 2.1 x 2.1 cm. Perched aesthetically on matrix is a lustrous and gemmy, color-zoned sapphire and ruby crystal measuring 1.5 cm in length. It is completely freestanding with a fully exposed termination. The crystal is complete all around. It is gemmy, transparent even with minimal backlighting. As with other specimens from this find, the color varies from more red to more purple depending on light spectrum but this leans mostly to Ruby. A superb matrix ruby specimen.
1.6 x 1.1 x 1.1 cm. Unusual for this locality, here we have a stereotypical ruby crystal of classic hexagonal form and pink-red color. It looks more Russian or Vietnamese in form, but it’s from the same place as the odd bi-colors and pure intense rubies we have seen come from Winza lately. Nicely doubly terminated, this prismatic crystal of lustrous and translucent ruby weighing 29 carats.
2.1 x 1.7 x 1.5 cm. This specimen features a sharp doubly terminated, lustrous and gemmy, lavender and red, bi-colored crystal atop that is about 1 cm across. It is very gemmy. When backlit, this crystal shows particularly interesting zonation effects. 50 carats.
2.6 x 1.4 x 1.3 cm. A sharp, translucent, vibrant red thumbnail crystal of ruby from the classic gem mines of Burma, with good crystalline form all around. On the back it is roughly formed from contacts, but complete nevertheless. The piece is, when backlit, gloriously pigeon-blood red in color. Ex. Charlie Key.
8.5 x 3.2 x 2.9 cm. A very sharp, translucent, classically formed ruby from this famous gemstone district. This region was producing rubies as far back as the time of Alexander, and still does so today. But specimens with sharp crystals like this are seldom seen. The dominant crystal is a hair over 1 cm tall. Ex. Charlie Key.
5.7 x 2.4 x 2.1 cm. Yellow sapphires are among the rarer colors in nature, and large specimens of yellow sapphires that are truly good are very rare. This is an outstanding, dramatic piece with good color that is complete all around. Usually, these sapphires are found in so-called gem gravels, deposits subject to much rolling and erosional forces. Thus, most crystals of this size (38 grams) would be expected to be far more heavily rolled, damaged, broken, and chipped. This is as close as you can ask to pristine and doubly-terminated, making it a rarity.
1.8 x 0.6 x 0.5 cm (largest). A fine 2-piece sapphire set from the mines of Sri Lanka and the Irv Brown Collection. Both sapphires are pristine, doubly terminated, gemmy and lustrous. The blue one is a beautiful, light sky-blue and the complimentary/contrasting yellow one has intense striations, that the blue one lacks. A striking and desirable pair. These are classic Ratnapura crystals. Very representative of the species and locality. 8.48 carats.
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Rob Lavinsky, rob@irocks.com
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share specimen![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215246a.jpg]](db_pics/mdpics/MD-215246a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215247a.jpg]](db_pics/mdpics/MD-215247a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215247b.jpg]](db_pics/mdpics/MD-215247b.jpg)
![Corundum (Var: Sapphire), Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215249a.jpg]](db_pics/mdpics/MD-215249a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215327a.jpg]](db_pics/mdpics/MD-215327a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215327b.jpg]](db_pics/mdpics/MD-215327b.jpg)
![Corundum (Var: Ruby), Corundum (Var: Sapphire) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215329a.jpg]](db_pics/mdpics/MD-215329a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215330a.jpg]](db_pics/mdpics/MD-215330a.jpg)
![Corundum (Var: Sapphire), Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215331a.jpg]](db_pics/mdpics/MD-215331a.jpg)
![Corundum (Var: Sapphire), Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215331b.jpg]](db_pics/mdpics/MD-215331b.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215333a.jpg]](db_pics/mdpics/MD-215333a.jpg)
![Corundum (Var: Ruby), Corundum (Var: Sapphire) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215334a.jpg]](db_pics/mdpics/MD-215334a.jpg)
![Corundum (Var: Ruby) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215335a.jpg]](db_pics/mdpics/MD-215335a.jpg)
![Corundum (Var: Ruby), Corundum (Var: Sapphire) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215336a.jpg]](db_pics/mdpics/MD-215336a.jpg)
![Corundum (Var: Ruby), Corundum (Var: Sapphire) from Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania [db_pics/mdpics/MD-215336b.jpg]](db_pics/mdpics/MD-215336b.jpg)
![Corundum (Var: Ruby) from Mogok, Sagaing District, Mandalay Division, Burma (Myanmar) [db_pics/mdpics/MD-215474a.jpg]](db_pics/mdpics/MD-215474a.jpg)
![Corundum (Var: Ruby) from Jegdalek (Jagdalek; Jagdalak; Jagdalik) Ruby Mine, Sorobi District, Kabol (Kabul) Province, Afghanistan [db_pics/mdpics/MD-215477a.jpg]](db_pics/mdpics/MD-215477a.jpg)
![Corundum (Var: Ruby) from Jegdalek (Jagdalek; Jagdalak; Jagdalik) Ruby Mine, Sorobi District, Kabol (Kabul) Province, Afghanistan [db_pics/mdpics/MD-215477b.jpg]](db_pics/mdpics/MD-215477b.jpg)
![Corundum (Var: Sapphire) from Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka [db_pics/mdpics/MD-219236a.jpg]](db_pics/mdpics/MD-219236a.jpg)
![Corundum (Var: Sapphire) from Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka [db_pics/mdpics/MD-222493a.jpg]](db_pics/mdpics/MD-222493a.jpg)