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Holbrook Ruby Mine, Macon Co., North Carolina, USAi
Regional Level Types
Holbrook Ruby MineMine
Macon Co.County
North CarolinaState

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Latitude & Longitude (WGS84):
35° 16' 6'' North , 83° 21' 40'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Franklin3,940 (2017)9.7km
Dillsboro240 (2017)14.9km
Webster375 (2017)15.5km
Forest Hills372 (2017)15.5km
Sylva2,617 (2017)17.0km

Deposit:: MSHA INSPECTORS 1978
Deposit:: NOT ON 1980 OR 1981 MSHA LISTS
Deposit:: OLSON, J.C. & OTHERS, 1946, NC GEOL SURVEY, BULL 49, PLATE 2
Deposit:: FOR ATTACHMENT SEE 37-087-00003.
Commodities (Major) - Gemstone - Ruby
Development Status: Past Producer

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: Al2O3
Reference: U.S Bureau of Mines, Sep,1995
Corundum var: Ruby
Formula: Al2O3
Reference: U.S Bureau of Mines, Sep,1995
Corundum var: Sapphire
Formula: Al2O3
Reference: U.S Bureau of Mines, Sep,1995
Formula: Mg3Al2(SiO4)3
Reference: U.S Bureau of Mines/Spatial Data from the Minerals System/Mineral Industry Location System(Mas/Mils)CD-Rom,Sep,1995
Pyrope var: Rhodolite
Formula: Mg3Al2(SiO4)3
Reference: U.S Bureau of Mines/Spatial Data from the Minerals System/Mineral Industry Location System(Mas/Mils)CD-Rom,Sep,1995

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Ruby4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
Group 9 - Silicates
var: Rhodolite9.AD.25Mg3Al2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Unclassified Minerals, Mixtures, etc.
var: Ruby
var: Sapphire-Al2O3
var: Rhodolite

List of minerals for each chemical element

O Corundum (var: Ruby)Al2O3
O Corundum (var: Sapphire)Al2O3
O Pyrope (var: Rhodolite)Mg3Al2(SiO4)3
O CorundumAl2O3
O PyropeMg3Al2(SiO4)3
Mg Pyrope (var: Rhodolite)Mg3Al2(SiO4)3
Mg PyropeMg3Al2(SiO4)3
Al Corundum (var: Ruby)Al2O3
Al Corundum (var: Sapphire)Al2O3
Al Pyrope (var: Rhodolite)Mg3Al2(SiO4)3
Al CorundumAl2O3
Al PyropeMg3Al2(SiO4)3
Si Pyrope (var: Rhodolite)Mg3Al2(SiO4)3
Si PyropeMg3Al2(SiO4)3

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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