Minerals Review Ruby Deposits: a review and Geological Classification Gaston Giuliani


Figure 11. Variations of the ruby trapiche texture. (A



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ruby deposits[01-22]
Figure 11. Variations of the ruby trapiche texture. (A) Variation of the core, which corresponds to the 
pinacoidal growth sectors (in grey). These sectors have a tapered shape and the core size varies as a 
function of the orientation of the cross-section; (B) aspect of the section near the vertex of the pyramid; 
and (C) aspect of the section if cut in the vertex plane. Photos by Isabella Pignatelli of two trapiche 
rubies from Mong Hsu, Myanmar. 
Figure 12. X-ray computed tomography image showing the high porosity (in black) of a trapiche ruby 
from Luc Yen, North Vietnam [57]. The porosity corresponds to 0.6% of the ruby volume and is 
developed in the sector boundaries. Photo: Christophe Morlot. 
Tube-like voids filled with carbonates, liquid, and/or gas may be observed in the growth sectors 
(Figure 13) [51,57,62]. These can develop from the core or sector boundaries and extend into the 
growth sectors, running perpendicular to the sectors with an inclination of 5° relative to the {0001} 
ruby faces. Sometimes the tube-like voids can be parallel to the c axis. 
Garnier et al.
[58,59] found single-phase (liquid), two-phase (liquid + gas), and three-phase (liquid + 
gas + solid) inclusions between the tube-like voids and/or their extensions into the sector boundaries. 
Microthermometry and Raman spectrometry indicate that these inclusions correspond to the trapping of 
two immiscible fluids during the ruby formation: a carbonic fluid in the CO
2
-H
2
S-COS-S
8
-AlO(OH) 
system and molten salts [62–64]. These fluids are considered the product of metamorphism of evaporites 
during the devolatization of carbonates and thermochemical-sulfate reduction. 
Figure 11.
Variations of the ruby trapiche texture. (A) Variation of the core, which corresponds to the
pinacoidal growth sectors (in grey). These sectors have a tapered shape and the core size varies as a
function of the orientation of the cross-section; (B) aspect of the section near the vertex of the pyramid;
and (C) aspect of the section if cut in the vertex plane. Photos by Isabella Pignatelli of two trapiche
rubies from Mong Hsu, Myanmar.

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