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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Chlorite Group from
Blue Jay Mine, Jamestown, Jamestown Mining District, Boulder County, Colorado, USA


Locality type:Mine
Classification
Species:'Chlorite Group' (not an IMA approved species)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chlorite Group data
Locality Data:Click here to view Blue Jay Mine, Jamestown, Jamestown Mining District, Boulder County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:662714
Long-form Identifier:1:3:662714:0
GUID (UUID V4):0
Nearest other occurrences of Chlorite Group
5.5km (3.4 miles) ⓘCash Mine, Gold Hill, Gold Hill Mining District, Boulder County, Colorado, USA
8.1km (5.0 miles) ⓘGrand Republic Occurrence, Gold Hill Mining District, Boulder County, Colorado, USA
10.3km (6.4 miles) ⓘSmuggler Mine, Jamestown Mining District, Boulder County, Colorado, USA
11.1km (6.9 miles) ⓘCopper Glance, Sunset, Boulder County, Colorado, USA
12.2km (7.6 miles) ⓘEureka Mine (Eureka Alta), Boulder County Tungsten Mining District, Boulder County, Colorado, USA
15.1km (9.4 miles) ⓘGreen Mountain kimberlite, Boulder County, Colorado, USA
20.2km (12.6 miles) ⓘMammoth Mine, Boulder County Tungsten Mining District, Boulder County, Colorado, USA
29.5km (18.3 miles) ⓘMena Mine (Hoffmeister Homestead Prospect; Black Judge Shaft), Ralston Buttes Mining District, Jefferson County, Colorado, USA
30.8km (19.1 miles) ⓘSchwartzwalder Mine (Ralston Creek Mine), Ralston Buttes Mining District, Jefferson County, Colorado, USA
38.8km (24.1 miles) ⓘNorth Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
References
Lovering, T.S., Goddard, E.N. (1950) Geology and ore deposits of the Front Range, Colorado. Professional Paper 223. US Geological Survey doi:10.3133/pp223
 
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