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Loudounite, a new zirconium silicate from Virginia

Pete J. Dunn and Dale Newbury
Loudounite, a new zirconium silicate from Virginia
The Canadian Mineralogist (February 1983) 21, Part 1: 37-40


Loudonite occurs as green to colourless spherules associated with actinolite, chlorite and ancylite in diabase from the Goose Creek Quarry, Loudoun County, Virginia, USA, and in a similar occurrence at the Fairfax Quarry, Centreville, Fairfax County, Virginia, USA. Microprobe analysis yielded SiO (sub 2) 45.8, Al (sub 2) O (sub 3) 0.8, FeO 2.0, MgO 0.3, CaO 12.1, ZrO (sub 2) 25.7, Na (sub 2) O 1.3, K (sub 2) O 0.2, H (sub 2) O 11.8 (by difference), = 100.0, approaching NaCa (sub 5) Zr (sub 4) Si (sub 16) O (sub 40) (OH) (sub 11) .8H (sub 2) O. The six strongest lines in the X-ray powder pattern are 2.931(10b), 4.06(7b), 7.37(6), 5.81(5), 2.694(4), 3.527(4) A. H. 4, D (sub meas) 2.48(3), streak colourless. Loudonite is biaxial with wavy extinction, length slow, alpha 1.536 gamma 1.550 (both + or - 0.004).

ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 21, Part 1
Title: Loudounite, a new zirconium silicate from Virginia
Affiliation: Smithson. Inst., Dep. Miner. Sci., Washington, DC, United States
Pages: 37-40
Published: 198302
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 7
Accession Number: 1983-036302
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N38°49'60" - N39°15'00", W78°00'00" - W77°19'60"
Secondary Affiliation: Natl. Bur. Stand., USA, United States
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1983
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