Fluorite, A. L. Davis No. 4 Mine, Cave-in-Rock, Hardin County, Illinois, USA
Size: 6.0x3.5x2.5cm
Species: Fluorite
Locality: A. L. Davis No. 4 Mine (Mahoning No. 4 Mine; Annie No. 4, Ozark-Mahoning group, Cave-in-Rock, Hardin County, Illinois, USA
Description: This specimen comes from a very rarely seen locality. It is not that this locality did not produce, it is that miners simply were not careful about keeping track of localities when they collected specimens. You were lucky if the miner put the company down on the label, much less keeping track of the exact mine. This specimen consists of digital growth glassy blue cubes with delicate phantoms of blue and a light yellow core. Jordan Roots photograph had an excellent write up on Mindat researched by Jamison Kilby Brizendine that I will place below for background information on this locality.
“The A.L. Davis shaft was sunk in 1951, exploiting an ore body called the Davis-Oxford ore body. Much of the information on this particular ore body comes from a brief paper published by Chief Geologist, B.L. Perry of the Ozark-Mahoning Company (1973). Much of the ore from the Davis-Oxford ore body was hauled though a number of shafts, including the M.F. Oxford #7, the A.L. Davis #4 and the Heavy-Media Shaft (#16). The Davis-Oxford orebody was a NE-SW replacement orebody, approximately 14,000 feet in total length, a width of 150 feet and a height of approximately 10 feet. The orebody was immediately below the Mississippian Bethel Sandstone Formation. The ore consisted of fluorspar replacement in the upper portions of the Renault/Downey's Bluff Limestone. Yellow fluorite was where the high-grade zones of fluorspar was found, while purple fluorite found in the ore body was considered lower grade material. Sphalerite and baryte were also encountered in the orebody, as well as chalcopyrite, marcasite, pyrite and witherite, though the latter mineral was rare.” “Blue fluorites from the Edgar Davis-Oxford orebody were extracted sometime between the 1960s to 1979.”
Jamison Kilby Brizendine - Personal Communication
Perry, B.L., 1973, The Davis-Oxford Ore body in Baxter et al., 1973 (A geologic excursion to fluorspar mines in Hardin and Pope Counties, Illinois): Illinois State Geological Survey, Guidebook Series 11: p. 24-27.
Ex. D. Adam Sohn
Size: 6.0x3.5x2.5cm
Species: Fluorite
Locality: A. L. Davis No. 4 Mine (Mahoning No. 4 Mine; Annie No. 4, Ozark-Mahoning group, Cave-in-Rock, Hardin County, Illinois, USA
Description: This specimen comes from a very rarely seen locality. It is not that this locality did not produce, it is that miners simply were not careful about keeping track of localities when they collected specimens. You were lucky if the miner put the company down on the label, much less keeping track of the exact mine. This specimen consists of digital growth glassy blue cubes with delicate phantoms of blue and a light yellow core. Jordan Roots photograph had an excellent write up on Mindat researched by Jamison Kilby Brizendine that I will place below for background information on this locality.
“The A.L. Davis shaft was sunk in 1951, exploiting an ore body called the Davis-Oxford ore body. Much of the information on this particular ore body comes from a brief paper published by Chief Geologist, B.L. Perry of the Ozark-Mahoning Company (1973). Much of the ore from the Davis-Oxford ore body was hauled though a number of shafts, including the M.F. Oxford #7, the A.L. Davis #4 and the Heavy-Media Shaft (#16). The Davis-Oxford orebody was a NE-SW replacement orebody, approximately 14,000 feet in total length, a width of 150 feet and a height of approximately 10 feet. The orebody was immediately below the Mississippian Bethel Sandstone Formation. The ore consisted of fluorspar replacement in the upper portions of the Renault/Downey's Bluff Limestone. Yellow fluorite was where the high-grade zones of fluorspar was found, while purple fluorite found in the ore body was considered lower grade material. Sphalerite and baryte were also encountered in the orebody, as well as chalcopyrite, marcasite, pyrite and witherite, though the latter mineral was rare.” “Blue fluorites from the Edgar Davis-Oxford orebody were extracted sometime between the 1960s to 1979.”
Jamison Kilby Brizendine - Personal Communication
Perry, B.L., 1973, The Davis-Oxford Ore body in Baxter et al., 1973 (A geologic excursion to fluorspar mines in Hardin and Pope Counties, Illinois): Illinois State Geological Survey, Guidebook Series 11: p. 24-27.
Ex. D. Adam Sohn
Size: 6.0x3.5x2.5cm
Species: Fluorite
Locality: A. L. Davis No. 4 Mine (Mahoning No. 4 Mine; Annie No. 4, Ozark-Mahoning group, Cave-in-Rock, Hardin County, Illinois, USA
Description: This specimen comes from a very rarely seen locality. It is not that this locality did not produce, it is that miners simply were not careful about keeping track of localities when they collected specimens. You were lucky if the miner put the company down on the label, much less keeping track of the exact mine. This specimen consists of digital growth glassy blue cubes with delicate phantoms of blue and a light yellow core. Jordan Roots photograph had an excellent write up on Mindat researched by Jamison Kilby Brizendine that I will place below for background information on this locality.
“The A.L. Davis shaft was sunk in 1951, exploiting an ore body called the Davis-Oxford ore body. Much of the information on this particular ore body comes from a brief paper published by Chief Geologist, B.L. Perry of the Ozark-Mahoning Company (1973). Much of the ore from the Davis-Oxford ore body was hauled though a number of shafts, including the M.F. Oxford #7, the A.L. Davis #4 and the Heavy-Media Shaft (#16). The Davis-Oxford orebody was a NE-SW replacement orebody, approximately 14,000 feet in total length, a width of 150 feet and a height of approximately 10 feet. The orebody was immediately below the Mississippian Bethel Sandstone Formation. The ore consisted of fluorspar replacement in the upper portions of the Renault/Downey's Bluff Limestone. Yellow fluorite was where the high-grade zones of fluorspar was found, while purple fluorite found in the ore body was considered lower grade material. Sphalerite and baryte were also encountered in the orebody, as well as chalcopyrite, marcasite, pyrite and witherite, though the latter mineral was rare.” “Blue fluorites from the Edgar Davis-Oxford orebody were extracted sometime between the 1960s to 1979.”
Jamison Kilby Brizendine - Personal Communication
Perry, B.L., 1973, The Davis-Oxford Ore body in Baxter et al., 1973 (A geologic excursion to fluorspar mines in Hardin and Pope Counties, Illinois): Illinois State Geological Survey, Guidebook Series 11: p. 24-27.
Ex. D. Adam Sohn
