Sulfide standards - Gerald Czamankse

[BenjaminWade]

Hi all,
I know this is a long shot, but I was after any information from the community regarding a set of sulfide material produced by Gerald Czamankse at the USGS in the early 70's. More to the point whether they were usable, and if so is there any still kicking about for use?

Cheers

[Probeman]

I know this is a long shot, but I was after any information from the community regarding a set of sulfide material produced by Gerald Czamankse at the USGS in the early 70's. More to the point whether they were usable, and if so is there any still kicking about for use?

I remember those standards.  There were some mounted up when I started at Berkeley many years ago, but there was no extra material I think.  You might ask Sean Mulcahy there though.

Some of these are listed in my default standard database:

Selected Standards:

St  617 PbS (synthetic)
St  617 PbS (synthetic)
TakeOff = 40.0  KiloVolt = 15.0  Density =  7.500

From Czemanske
(assumed stoichiometric)
Elemental Composition

Average Total Oxygen:         .000     Average Total Weight%:   99.990
Average Calculated Oxygen:    .000     Average Atomic Number:   73.155
Average Excess Oxygen:        .000     Average Atomic Weight:  119.628

ELEM:       Pb       S
XRAY:      ma      ka
ELWT:   86.590  13.400
KFAC:    .8696   .1431
ZCOR:    .9958   .9366
AT% :   50.001  49.999

St  620 CuFeS2 (synthetic)
St  620 CuFeS2 (synthetic)
TakeOff = 40.0  KiloVolt = 15.0  Density =  4.200

From Czemanske (Chalcopyrite)
(assumed stoichiometric)
Elemental Composition

Average Total Oxygen:         .000     Average Total Weight%:  100.000
Average Calculated Oxygen:    .000     Average Atomic Number:   23.544
Average Excess Oxygen:        .000     Average Atomic Weight:   45.878

ELEM:       Cu      Fe       S
XRAY:      ka      ka      ka
ELWT:   34.620  30.430  34.950
KFAC:    .3152   .3027   .3151
ZCOR:   1.0984  1.0052  1.1093
AT% :   24.994  24.998  50.007

St  624 Ag2S (synthetic)
St  624 Ag2S (synthetic)
TakeOff = 40.0  KiloVolt = 15.0  Density =  7.300

From Alpha Aesar (#89473)
99.9+%, Lot #030281
Assumed stoichiometric
Elemental Composition

Average Total Oxygen:         .000     Average Total Weight%:  100.000
Average Calculated Oxygen:    .000     Average Atomic Number:   42.989
Average Excess Oxygen:        .000     Average Atomic Weight:   82.599

ELEM:       Ag       S
XRAY:      la      ka
ELWT:   87.060  12.940
KFAC:    .8258   .1322
ZCOR:   1.0542   .9791
AT% :   66.666  33.334

St  625 AgBiS2 (synthetic)
St  625 AgBiS2 (synthetic)
TakeOff = 40.0  KiloVolt = 15.0  Density =  6.900

From Czemanske
Elemental Composition

Average Total Oxygen:         .000     Average Total Weight%:  100.000
Average Calculated Oxygen:    .000     Average Atomic Number:   61.529
Average Excess Oxygen:        .000     Average Atomic Weight:   95.244

ELEM:       Bi      Ag       S
XRAY:      ma      la      ka
ELWT:   54.854  28.314  16.833
KFAC:    .5382   .2201   .1749
ZCOR:   1.0191  1.2866   .9627
AT% :   25.000  25.000  50.000

St  626 As2S3 (synthetic)
St  626 As2S3 (synthetic)
TakeOff = 40.0  KiloVolt = 15.0  Density =  3.490

From Czemanske
May be AsS (orange color)
Large grains, difficult to see in reflection
Elemental Composition

Average Total Oxygen:         .000     Average Total Weight%:  100.000
Average Calculated Oxygen:    .000     Average Atomic Number:   26.354
Average Excess Oxygen:        .000     Average Atomic Weight:   49.207

ELEM:       As       S
XRAY:      la      ka
ELWT:   60.903  39.097
KFAC:    .5700   .3214
ZCOR:   1.0686  1.2164
AT% :   40.000  60.000

[BenjaminWade]

Great, thanks Probeman! I will email Sean and see what happens.