Rosell Minerales
RM2705 Corundum, var. ruby
Mundarara Mine, Longido, Arusha, TanzaniaVery bright corundum crystal, var. ruby, very well defined and pink to brown in color. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.
Size: 1.6 x 1.5 x 0.7 cm.
Found in ± 1973.
Col. Joan Astor (Barcelona).
Fluorescent under long wave UV

RM2704 Corundum, var. ruby, and zoisite
Mundarara Mine, Longido, Arusha, TanzaniaClassic ruby specimen, cherry to pink in color, embedded in a matrix of zoisite and micas. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.
Size: 2.7 x 2.2 x 1.5 cm.
Found in ± 1974.
Col. Joan Astor (Barcelona).
Fluorescent under long wave UV

RM1853 Ferro-hornblende
Gairo, Kilosa, Morogoro, TanzaniaInteresting specimen of ferro-hornblende from a little known African locality. Various pseudocubic crystals of deep greenish tone. It is difficult to find specimens of this quality for the species. Named in 1789 by Abraham Gottlieb Werner from an old German term for dark minerals with no ore value and from "blende", meaning to deceive in allusion to it occurring in ore deposits but not yielding any metal and for ferro- indicating Fe2+ as a dominant cation.
Size: 4.5 x 3.6 x 3 cm.
Main crystal: 7 x 6 mm.

RM365 Spessartine
Sangulungulu Hill, Naan, Loliondo, Ngorongoro, Arusha, TanzaniaA very sharp and complete trapezohedral spessartine crystal. Really nice and uniform color, translucent and good luster. This specimen shows a very interesting gem quality.
These crystals came from a deposit near the town of Loliondo, close to the Serengeti National Park and the border of Tanzania and Kenya.
Size: 2,4 x 2,4 x 2,3 cm.
Found in 2009
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