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


Locality type:Quarry
Classification
Species:Zircon var: Cyrtolite
Formula:Zr[(SiO4),(OH)4]
Comments:Schooner (1955) says that: "crystals are of small size. Parallel groups are often found in cleavelandite and smoky quartz, and other matrices include manganapatite, microcline, lithiophilite, and various mixtures. The crystals have such short prisms that they resemble distorted dodecahedrons, probably being mistaken for opaque garnets by some collectors." The size rarely exceeds 1/4 inch.
Habit:short prismatic, parallel groups
Colour:brown or black
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Cyrtolite data
Locality Data:Click here to view Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96192
Long-form Identifier:1:3:96192:3
GUID (UUID V4):0
Nearest other occurrences of Cyrtolite
1.6km (1.0 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
3.8km (2.3 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
3.8km (2.3 miles) ⓘCase Quarries, Portland, Middlesex County, Connecticut, USA
4.1km (2.6 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
4.4km (2.7 miles) ⓘAndrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
5.4km (3.3 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
6.8km (4.2 miles) ⓘTollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
8.7km (5.4 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
12.0km (7.5 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
References
Schooner, Richard (1955) 90 Minerals from 1 Connecticut Hill. Rocks & Minerals, 30 (7-8). 351-358 doi:10.1080/00357529.1955.11767837
 
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