Very 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.

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Classic 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.

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Interesting 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.

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A 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.