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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Cassiterite from
Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA


06350770017389769732110.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
01470040017272013424967.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
00317970017272013487407.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
03212050017272013536499.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
06350770017389769732110.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
01470040017272013424967.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
00317970017272013487407.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
03212050017272013536499.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
05095880017390605493476.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
01470040017272013424967.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
00317970017272013487407.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
03212050017272013536499.jpg
Cassiterite, etc.

Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
Locality type:Quarry
Classification
Species:Cassiterite
Formula:SnO2
Comments:Tiny, dark, lustrous, sharp crystals typically embedded in lepidolite or spodumene with K-rich albite. Can easily be confused with tantalite-(Mn) or wodginite, though these minerals are differentiated from it by their strong iridescence.
Habit:twinned bipyramids
Colour:deep red-black to dark brown
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Albite9
- var Cleavelandite6
Quartz7
Elbaite2
Muscovite1
Data
Mineral Data:Click here to view Cassiterite data
Locality Data:Click here to view Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
Photo GalleryView Gallery (6 photos)
Data Identifiers
Mindat Occurrence Record ID:96102
Long-form Identifier:1:3:96102:0
GUID (UUID V4):0
Nearest other occurrences of Cassiterite
3.0km (1.8 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
4.0km (2.5 miles) ⓘRiverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
5.7km (3.5 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
9.4km (5.8 miles) ⓘBrack Gem prospect (Brack prospect), East Glastonbury, Glastonbury, Hartford County, Connecticut, USA
10.2km (6.4 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
13.0km (8.1 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
60.4km (37.5 miles) ⓘLane's Mine (Lane's Lead and Silver Mine; Elm Street), Monroe, Fairfield County, Connecticut, USA
71.5km (44.4 miles) ⓘBlandford mica mines, Blandford, Hampden County, Massachusetts, USA
95.4km (59.3 miles) ⓘClark Ledge pegmatite locality, Chesterfield, Hampshire County, Massachusetts, USA
99.5km (61.9 miles) ⓘBarrus farm pegmatite localities, Goshen, Hampshire County, Massachusetts, USA
References
Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
 
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