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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Bertrandite from
Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USA


09971470017272019373417.jpg
Bertrandite

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03897050017271982183531.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03429960017271982149214.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
05525100017271982221674.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
08057290017370777182608.jpg
Bertrandite

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03897050017271982183531.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03429960017271982149214.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
05525100017271982221674.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
07741280017272019422936.jpg
Bertrandite

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03897050017271982183531.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
03429960017271982149214.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
05525100017271982221674.jpg
Bertrandite, etc.

Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA
Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Comments:Typically as secondary micro-crystals from alteration of beryl.
Habit:complex micro-crystals
Colour:colorless
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Albite23
- var Cleavelandite3
K Feldspar17
- var Adularia17
Elbaite11
Microcline7
Quartz7
Calciomicrolite5
Fluorite3
- var Chlorophane2
Muscovite2
Metatorbernite1
Beryl1
Schorl1
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USA
Photo GalleryView Gallery (16 photos)
Data Identifiers
Mindat Occurrence Record ID:130232
Long-form Identifier:1:3:130232:5
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
0.5km (0.3 miles) ⓘLong Hill prospects (Turkey Hill prospects), Haddam, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
3.4km (2.1 miles) ⓘConnecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
4.1km (2.5 miles) ⓘQuarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
7.1km (4.4 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
8.7km (5.4 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
9.4km (5.9 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
12.2km (7.6 miles) ⓘTollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
13.5km (8.4 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
14.0km (8.7 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
References
Weber, Marcelle H., Sullivan, Earle C. (1995) Connecticut Mineral Locality Index. Rocks & Minerals, 70 (6) 396-409 doi:10.1080/00357529.1995.11761569
 
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