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                             Malaya Garnet
         
     
     
  The Story  
A day of July 1996 whereas I stopped in a small village in Madagascar; one presented samples of a strange stone to me.  At first sight its color could reminds certain zircon, but I quickly identified it as garnet.  After some palaver, one led me to the place of the discovery.  I must acknowledge that I already knew the inhabitants with whom we tied friendship the previous year.  On the spot, a notch of about one meter fifty in a white color rock had created a not very impressive hole.  But, according to its authors, it was particularly painful to produce it with iron bars only.  I readily believed them after to be approached to the rock. Some particles of this stone to the orange - pink-brown reflections remained taken in the bedrock.  I encouraged my friends to be still sought.
The first samples extracted from a not disaggregated leptynite did not exceed 3.15 cts. after
cutting.
The observation under day light and incandescent light showed a clear difference in color.
Its change, from the champagne color under daylight, to an intense red for some, or to
pink-orange for others is due to chromium and vanadium traces.
This characteristic confers an attractive aspect on these gems.
   
Other samples were orange-yellow and did not change color under the various sources of lighting.
Unfortunately, the very hard and compact rock in this place, did not allow to extract many stones
from it, and the occurrence was abandoned a few weeks after its discovery.

 



Opposite, first samples cut in 1996 showing a change of color.  
         Color change malaya garnet, orange Madagascar gemstone, exclusive pyrope spessartite gems, malaya information data
Color change malaya garnet, orange Madagascar gemstone, exclusive pyrope spessartite gems, malaya information data Pink red malaya garnet, pink Madagascar gemstone, exclusive pyrope spessartite gems, malaya information data 
   
                             Above, an orange malaya found also in the
                                         primary occurrence. (It does not change color)
 This is two years later, in September 1998 exactly, that returning in the small village, the
samples more or less similar to those which I made cut in 1996 were found. They were turbid because of the fine rain of small inclusions they contained.  Their color was definitely more orange than malaya garnets from the first occurrence.  Indeed, they did not come from the same place.  This is a little more than one kilometer of distance that the elluvionnar deposit was discovered. 
I was immediately conscious to be the witness of a rare moment in the career of an impassioned
person for precious stones.
At this time orange garnet fever was launched.
The stone did not show almost any more change, its champagne-orange color at the day
was simply reinforced in a vivid orange or for other elements in an orange-red under electric light.
This type of garnet is a pyrope-spessartite also containing vanadium and chromium traces.
On the totality of Malaya extracted, a small part was pure, but much showed typical inclusions of
this stone.
Initially networks of rutile needles and strain patterns were often present, and inclusions of
graphite accompanied them.
Negative crystals and, quartz, apatite, monazite and zircon had been also invited during the
growth of the precious malaya garnet.
                 Oval malaya garnet, orange Madagascar gemstone, exclusive pyrope spessartite gems, malaya information data
      Here, the first pyrope-
    spessartite cut in 1998.
 Realized in an arid landscape composed of bushes and cactus, this discovery remains
exceptional by the quality of its product and also by the fact that it was the second deposit in
the world to deliver this type of Malaya garnet.

 
               Here, one of the single intact garnets 
               found in the occurrence.
               Its unusual stacking shape must be noticed.
  Refractive Index: 1.73 - 1.81
Chemical Composition: [Mg3 + Mn3]AL2(SIO4)
Hardness:  7 - 7.5
Density:  3.65 - 4.20
Crystal Group: Cubic
 

 

  Almandine Fe3Al2(SiO4)3
  Pyrope Mg3Al2(SiO4)3
  Spessartite Mn3Al2(SiO4)3
Above, the single phlogopite mica found in the neighborhood of the deposit at that time, it is still
in its gangue. Of transparent quality, it shows a similar color to that of malaya garnets.
" Personal Collection  A. Darbellay "
Here, typical rough material found at that time.
Its original shape has been altered.
Geology, Introduction :
Crystal schists.
The most striking character of the group in this region is the extreme abundance of graphite
which occurs mainly in leptynites , but also in a wide variety of rocks and then as accessory
element.
The group also comprises biotite gneiss, amphibolite gneiss, feldspathic amphibole or not,
quartzites, metamorphic marbles, some micaschists. Plagioclase are playing a very subordinate role.
The frequency of the garnet is great. Most characteristicals minerals are graphite, amphibole,
orthoclase ( leptynites ), biotite, and garnet.
Old granites are extremely rare and transformed into orthogneiss.
In its most part, the group is mainly of paragneiss origin. We must except leucocratic
ortholeptynites that easily separate from abundant paraleptynites rich in garnet.
Graphitic leptynites are fully leucocratic rocks without aluminous minerals, at kaolinized feldspars.
Their mode of occurrence, as regular intercalation in the schistosity, seems to indicate a
sedimentary origin, but similar leptynites often eyed and loaded of graphite, overlap significantly
stratification in some place. In this case it derived markedly of leucocratic granites and pegmatites.
The mineralization comprises graphite, garnet, manganese, and gold.
The only malaya garnets found intact, in their original 
shape, at the time of the discovery in 1998.
" Personal Collection  A. Darbellay "
Anorthosito-noritic clumps.
All these clumps are roughly subinterstratified 
in crystalline schists, but show recuting  
fingerings and contain intact enclaves,  
sometimes important, in crystalline schists. 
Then, in detail, there are between gabbroic 
clumps and host rocks crystalline schists, local 
discrepancies that seem to imply posterity 
gabbros compared with schists. These 
phenomena are esecially distinct in the 
South-eastern part of the clump near the
village of Fenoanevo, where a series of intact
enclaves, although surrounded by a border of 
anorthosic gneiss and leuco noritic, appears in 
stratigraphic continuity with the neighboring 
base. It is the same thing in the other clumps
of the region. ""The presence of such enclaves
is likely to mean for anorthosite and rocks that 
accompany an "in situ" formation in the solid 
state. These clumps appear in the Basic series 
of Graphite-Manganese System. They appear 
on both sides of the Graphite beam, they 
underline the limits, both western and eastern, 
with the external systems, Vohiborian in the 
West and Androyen in the East.
     
 
 
 
Enclaves of crystalline schists. Small enclaves of crystalline schists were identified within the 
gabbroic mass. These enclaves, which dimensions are of the order of several hundreds of meters 
long and tens of meters wide, seem to have retained without any alteration their orientation and 
initial petrographic composition. This is leptynites, leptynitic gneiss, sillimanite gneiss and 
micaschists. Important point to note, the hyperaluminous character of these formations is in 
harmony with the rich in alumina-anorthosito hyperitic complex.
     

 

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© All of the pictures on this website have been shot by gggems.com Alain Darbellay
      Text written by Alain Darbellay
         Géological References: A. Lacroix, J.Giraud, M. Raoult, H.Bessairies.
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