Collection:
Juneau—Douglas City Museum
Object ID:
2003.57.043 A—I
Accession#:
2003.57
Credit Line:
Donated by the U.S. Bureau of Land Management.
Object Name:
Sample, Mineral
Title:
Small Flat Grain Sample Disk
Date:
1950
Description:
Nine grain sample specimen mounts. Round flat epoxy resin disks with grain samples exposed on one side and highly polished. Paper labels on backs with handwritten sample identification.
A — Coarse grained. White metal in non—opaque grains. Blue copper oxide. "12—22—66 / 10 X 28 / gue / brown / lin(?) / 6 123" on back
B — Fine grained. Two divisions of grains: higher density grains are opaque mineral concentrate, lower density has majority of non—opaque minerals. "3—10—70 / 6 / pyrr chaleo / 70—17". Primarily pyrrhotite and chaliopyrite (iron & copper sulfides).
C — Fine grained. Divided into three sections. "10/27—67 / Magn #1 / #silm / #2 part magn. gal & itn / 7153". Primarily magnetite and galena.
D — Fine grained. "8—27—69 / cubanite / 9—62". Copper sulfide.
E — Coarse grains. "7—10—70 / 29—WC—70 / C12 Mn + Ti / R202 O Mno Fe / W 173 Ti + Mn 70—64".
F — Fine grained. "Check / Bi / mineral".
G — Fine grained. "1—24—71" / ? Green ink…"
H — Fine grained. "8—30—71 / 2 — PX — 062671 / 71—54".
I — Coarse grains. "9—10—67 / …[notes from mineral identification]".
A — Coarse grained. White metal in non—opaque grains. Blue copper oxide. "12—22—66 / 10 X 28 / gue / brown / lin(?) / 6 123" on back
B — Fine grained. Two divisions of grains: higher density grains are opaque mineral concentrate, lower density has majority of non—opaque minerals. "3—10—70 / 6 / pyrr chaleo / 70—17". Primarily pyrrhotite and chaliopyrite (iron & copper sulfides).
C — Fine grained. Divided into three sections. "10/27—67 / Magn #1 / #silm / #2 part magn. gal & itn / 7153". Primarily magnetite and galena.
D — Fine grained. "8—27—69 / cubanite / 9—62". Copper sulfide.
E — Coarse grains. "7—10—70 / 29—WC—70 / C12 Mn + Ti / R202 O Mno Fe / W 173 Ti + Mn 70—64".
F — Fine grained. "Check / Bi / mineral".
G — Fine grained. "1—24—71" / ? Green ink…"
H — Fine grained. "8—30—71 / 2 — PX — 062671 / 71—54".
I — Coarse grains. "9—10—67 / …[notes from mineral identification]".
Notes:
See 2003.57.001.
Used by U.S. Bureau of Mines for mineral resource evaluation & analysis. Samples made & ID in petrographic lab by Walter Gnagy, geologist. Specimens used for ID of opaque minerals under reflected light microscope using science of ore microscopy.
Used by U.S. Bureau of Mines for mineral resource evaluation & analysis. Samples made & ID in petrographic lab by Walter Gnagy, geologist. Specimens used for ID of opaque minerals under reflected light microscope using science of ore microscopy.
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Geological
T&E
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Small Flat Gram Sample Disk
Small Flat Gram Sample Disk
Small Flat Gram Sample Disk
Small Flat Gram Sample Disk