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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Ankerite from
Brown Spar (Browns Spar; Brownspar), Jamestown Mining District, Boulder County, Colorado, USA


Locality type:Mine
Classification
Species:Ankerite
Formula:Ca(Fe2+,Mg)(CO3)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Ankerite data
Locality Data:Click here to view Brown Spar (Browns Spar; Brownspar), Jamestown Mining District, Boulder County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:662738
Long-form Identifier:1:3:662738:6
GUID (UUID V4):0
Nearest other occurrences of Ankerite
0.5km (0.3 miles) ⓘEmmett Mine, Jamestown, Jamestown Mining District, Boulder County, Colorado, USA
1.7km (1.1 miles) ⓘBlue Jay Mine, Jamestown, Jamestown Mining District, Boulder County, Colorado, USA
3.7km (2.3 miles) ⓘJohn Jay Mine, Jamestown Mining District, Boulder County, Colorado, USA
6.5km (4.0 miles) ⓘCorning Tunnel (Cold Spring; Alamakee; St. Joe; Blackhawk; Cash Occurrence), Gold Hill Mining District, Boulder County, Colorado, USA
6.8km (4.2 miles) ⓘInterocean Mine, Gold Hill Mining District, Boulder County, Colorado, USA
7.9km (4.9 miles) ⓘIngram mine (Valley Forge Occurrence; Critic and Railroad Boy; Sunshine; Three Brothers; Atchison; Belle; Golden Eagle; Melvina; Baron; Richmond), Gold Hill Mining District, Boulder County, Colorado, USA
17.1km (10.6 miles) ⓘCold Spring Mine, Boulder County Tungsten Mining District, Boulder County, Colorado, USA
31.1km (19.3 miles) ⓘMena Mine (Hoffmeister Homestead Prospect; Black Judge Shaft), Ralston Buttes Mining District, Jefferson County, Colorado, USA
32.4km (20.2 miles) ⓘSchwartzwalder Mine (Ralston Creek Mine), Ralston Buttes Mining District, Jefferson County, Colorado, USA
39.2km (24.4 miles) ⓘAscension Mine (Nare Lease; Nair Prospect), Ralston Buttes 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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