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English: Corundum (Var.: Sapphire)
Locality: Zazafotsy Quarry (Amboarohy), Zazafotsy Commune, Ihosy District, Horombe Region, Fianarantsoa Province, Madagascar (Locality at mindat.org)
Size: 6.8 x 4.5 x 4.4 cm.
For both size range and overall quality, this is one of the best examples I have had of the recently found bi-colored Corundums from Madagascar. I obtained it in 2006, and have not seen better come out since that time, with crystals of such robust size (2.6 x 2.5 x 1.3 cm). It features a single crystal perched castle-like on matrix. That crystal is complete-all-around and terminated all around except a slight bit of ingrown matrix on one narrow edge; and remarkably not repaired. They go varying shades of red/purple and even to blue-purple depending on which lighting source you use to look at them. The effect is not subtle, either – it’s pretty obvious. These corundums are technically called sapphires on the market but to me, I cannot decide which to label them as, because under strong halogen they look as much like rubies as anything. This piece has superior color change, red/maroon in halogen and purple-blue in sunlight and fluorescent lighting.
Deutsch: Korund (Var.: Saphir)
Fundort: Zazafotsy Quarry (Amboarohy), Gemeinde Zazafotsy, Distrikt Ihosy, Region Horombe, Fianarantsoa , Madagaskar (Fundort bei mindat.org)
Größe: 6.8 x 4.5 x 4.4 cm.
Date before March 2010(2010-03)
Source http://www.mindat.org/photo-280372.html


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