Note 35 — LETTER—No. 55.
Reading edition
In Silliman’s American Journal of Science, Vol.
xxxvii.
,
p.
394, will be seen the following analysis of this mineral, made by Dr. Jackson of Boston, one of our best mineralogists and chemists; to whom I sent some specimens for the purpose, and who pronounced it, “
a new mineral compound, not steatite, is harder than gypsum, and softer than carbonate of lime
.”
Chemical Analysis of the Red Pipe Stone, brought by George Catlin, from the Côteau des Prairies, in 1836:
Water 8.4
Silica 48.2
Alumina 28.2
Magnesia 6.0
Carbonate of lime 2.6
Peroxide of iron 5.0
Oxide of manganése 0.6
——
99.0
——
Loss (probably magnesia) 1.0
——
100.0
——
Note.—All the varieties of this beautiful mineral, may at all times be seen in the Indian Museum; and by the curious, specimens may be obtained for any further experiments.