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S U } I M E R , 1 9 4 0

only on two edges is a sl ight yel low-

ish colorat ion apparent, penetlat ingdown to 5mm., possibly originated bysecondary infiltrations in the cleav-aEes.

The diamond sholvs a violet-blue

luminescence under the quartz coat-

ing.

The diamond "Presidente Vargas"

was founcl in Santo Antonio River,

Munic ipal i ty of Colomandel , State of

Minas-Geraes.

Study ol the Diqmond"Dcrcy Vcrrglcs" "

Study matle by Professor- Dr'.

Othon Henry Leonardos and Dr ' .

Reynaldo Saldanha da Cama, the

folmer, of the Nat ional Museum, and

the lat ter , of the Rio de Janeiro

Facul ty of Science and Phi losoPhY,

act ing wi th them as expert technical

appraiser ' , Mr ' . Esmelald ino Reis, of

the Mint Apprais ing and Classi fy ing

Bu reau ,

Hul t i t : The diamond Pi 'esents an

octahedrai habit rvith stlong defor'-

mat ion and accentuated lounding

(see f igure 2) . Undel cet ' ta in angles

i t has the aspect of a shapcless min-

e l a l ; unde t ' o t he l s , i t sho l vs t na l ked

f ur lo lvs ancl le-entel ' ings.

I lorphology: The existence is vel i -

f ied of a g i 'owth of pat a l le l indi -

v iduals wi th a p i 'edont inance of octa-

hed ron f aces (111 ) , ou t o f r vh i ch no

mole than one, in a certa in cofnel ' i

o f the specimen, is perfect ly p lane.

Betrveen th is ant l that indiv idual

there are still to be noted st-trall cube

faces (100) and faces of a t l iak iste-

t rahedton. I t t 'as impossib le to

obtain goniotr retr ic ureasulenlents.

Corrosiot t . ' T iny corrosion f igutes

ale to be observed on the curved and

deformed surfaces, only a very ferv

of them permit t ing to see, bY means

of a lens, their t r iangular contours,

mostly ill-defined. The large quantity

of these figules give the specit-uen

i ts lugose appearance. A beaut i fu l

microphotograph was obtained of a

large number of neat ly out l ined.

typical ly t r iangular f igures on the

srral l , f la t octahedlal face.

Color i t tg : The diarnond is perfect ly

t i 'anspal 'ent and of a marked chest-

nut hue. Exposed to u i t ra-v io let rays

i t shows no appreciable luminescence.

Sl tcc i f ic ( ) t u 'u i ty ; I t rvas deter-

m ined a t 21 ' C . , and f ound t o be

3.517, af te l apply ing correct ion for

1 ' ' c .

Th .e Du t t : y I ' u t ' 11 t s D in tno t t d ,

I ) intensiot ts : Measuleurents taken

in the posi t ion shown by f ig. 1 gave

the fo l lorv ing resul ts: Length, 53

r-nln. ; r 'v idth, i19.9 ninr . ; height , 25.6

nt l t t .

lTeight : The rveight of the sPeci-

men is .160.00 urct t ' ic carats. The dia-

rnond "Dalcy Vargas" was discov-

ered about tr,l 'o kilometres flom the

place rvhere the "Presidente Vargas"

diamond was fot tnd, in the Munic i -

pal i ty of Colornandel , State of

NI inas-Gelaes.

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