Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Tourmaline from
Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA


04204970017390989182710.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
06318880017404570376726.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
02791100017404570373878.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
04890410017272018688933.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
08254470017390704257784.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
09685640017404567306444.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
00516860017404551519119.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
07263980017408096605845.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
04204970017390989182710.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
01175190017408096611912.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
02791100017404570373878.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
04890410017272018688933.jpg
Elbaite, etc.

Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
Locality type:Prospect
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Comments:Associated with rare euhedral albite overgrowths, on brecciated microcline and albite, which the capillary tourmaline colors a pale blue due to its inclusion.
Habit:capilllary
Colour:black to pale blue
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Albite2
Microcline2
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Hollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:767489
Long-form Identifier:1:3:767489:1
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
0.5km (0.3 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.7km (1.1 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
2.7km (1.7 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
2.8km (1.7 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
5.6km (3.5 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
5.7km (3.5 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
6.4km (4.0 miles) ⓘBrack Gem prospect (Brack prospect), East Glastonbury, Glastonbury, Hartford County, Connecticut, USA
6.5km (4.0 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
8.0km (5.0 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
10.0km (6.2 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
References
Moritz, Harold (n.d.) Personal Communication.
 
and/or  
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