DYOS Tool

Natural Minerals Group

From the standards library of the SPI Supplies and the C. M. Taylor Company

# AS1240-AB

Monazite*

(Ce,La,Th)PO4
ElementWt % OxideWt %
O 27.08
Si 0.70SiO2 1.50
P 12.44P2O5 28.50
Ca 0.40CaO 0.56
Y 0.51Y2O3 0.65
La 13.56La2O3 15.90
Ce 29.46Ce2O3 34.50
Pr 3.33Pr2O3 3.90
Nd 8.14Nd2O3 9.50
Sm 0.86Sm2O3 1.00
Eu 0.10Eu2O3 0.09
Gd 0.39Gd2O3 0.45
Tb 0.03Tb2O3 0.04
Dy 0.10Dy2O3 0.12
Th 2.79ThO2 3.17
Sum 99.9 Sum 99.9
Locality: Kulyk Lake, Saskatchewan, Canada
This is a reflected light micrograph of polished, carbon coated monazite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. This phosphate mineral is one of our most popular standards, being in great demand because of its rare earth element content - lanthanum, cerium, praseodymium and neodymium, as well as the radioactive element thorium. The composition has recently been revised in light of new data collected by neutron activation analysis for the heavier REE. The formula works out as (La.23Ce.50Pr.06Nd.13SmEuGdTbDyThCaY)1.00(Si.06P.95)1.01O4.00.

* for a mineralogist's account of monazite click here
Name Description SPI # Each
Monazite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS1240-AB $199.56
Monazite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS1245-AB $199.56

# AS5360-AB

Monazite

(Alternate - either version of this item may be used in our Off-The-Shelf Standards)

(Ce,La,Th)PO4
ElementWt % OxideWt %
O 27.60
P 13.13P2O5 30.08
Ca 0.04CaO 0.06
La 18.6La2O3 21.8
Ce 30.6Ce2O3 35.8
Pr 2.54Pr2O3 2.97
Nd 6.39Nd2O3 7.45
Sm 0.41Sm2O3 0.48
Gd 0.10Gd2O3 0.12
Th 0.59ThO2 0.67
Sum100.0 Sum 99.5
Scandinavian monazite in polished section
Grains of monazite ranging up to 2mm
This is a hydrothermal monazite from Scandinavia
Name Description SPI # Each
Monazite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS5360-AB $199.56
Monazite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS5365-AB $199.56
   
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Saturday March 20, 2010
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