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Holbrook - iron and nickel content
Dave Andrews schrieb:
> Which brings me to the question: Can someone tell me the total Fe and
> Ni content of Gold Basin and Holbrook meteorites? The Holbrooks seem
> much lower in metal content when using a metal detector, but are both
> classified as L's.
Holbrook
Analysis, 21.56 % total iron, B. Mason and H.B. Wiik, GCA, 1961, 21,
p. 276. Olivine Fa25, B. Mason, GCA, 1963, 27, p.1011. XRF analysis,
19.8 % total iron, H. von Michaelis et al., Earth Planet. Sci. Lett.,
1969, 5, p. 387.
Preliminary Note on the Shower of Meteoric Stones near Holbrook, Navajo
County, Arizona, July 19th, 1912, including a Reference to the Perseid
Swarm of Meteors visible from July 11th to August 22nd ; by Warren M.
Foote, pp. 452-453:
Nickel-Iron Content
Mr. George C. Davis made the few chemical determinations of the aerolite
which limited time permitted. The specific gravity was found to be 3.22.
One hundred grains, freed from crust, were finely powdered and treated
repeatedly with the electromagnet. The metallic portion was washed with
alcohol to remove the silicates, but the separation was incomplete and
the silicates finally constituted about 25 per cent of the magnetic
concentrates. The material for analysis was taken from twelve
individuals.
Weight magnetic portion, actual 4.90
Weight nonmagnetic portion, actual 95.
Weight magnetic portion, corrected 3.675
The corrected weights give the following percentage for the aerolite:
Nickel-iron 3.68
Silica 96.32
Total = 100.00
Analysis magnetic concentrates:
Silica 14.12
lron 60.64
Nickel 11.84
Corrected for 25 per cent non-magnetic minerals present:
Iron 80.86
Nickel 15.79
Best regards and congrats on your Holbrook find. I've already taken the
liberty to save this JPEG. I hope you don't mind.
Bernd
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