New data on lazurite

D. D. Hogarth; W. L. Griffin

doi:10.1016/0024-4937(76)90055-4

New data on lazurite

D. D. Hogarth^*, W. L. Griffin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

46 Citations (Scopus)

Abstract

New data suggest the following chemical peculiarities of lazurite: 1. 1. The cell (cubic, a=9 A ̊) formula can be expressed as (R′,R′′)_7,5-8(Si,Al)₁₂(O,S)₂₄(SO₄,H₂O,Cl)_a·nH₂O; R′ signifies monovalent ions, chiefly Na; R′′ signifies divalent ions, essentially Ca. 2. 2. Si exceeds Al by 0.1 to 0.6 atoms per 9Å cell. Non-cubic (anisotropic and pleochroic) lazurite is common and may be caused by S_- ³ ions in parallel orientation. A 'perthitic' composite from Baffin Island has more Cl in the dark isotropic phase, less in the light anisotropic phase. 'Anomalous dispersion' results from absorption at 600 nm. Dark varieties contain more S^2- than pale varieties.

Original language	English
Pages (from-to)	39-54
Number of pages	16
Journal	Lithos
Volume	9
Issue number	1
DOIs	https://doi.org/10.1016/0024-4937(76)90055-4
Publication status	Published - 15 Jan 1976
Externally published	Yes

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title = "New data on lazurite",

abstract = "New data suggest the following chemical peculiarities of lazurite: 1. 1. The cell (cubic, a=9 A ̊) formula can be expressed as (R′,R′′)7,5-8(Si,Al)12(O,S)24(SO4,H2O,Cl)a·nH2O; R′ signifies monovalent ions, chiefly Na; R′′ signifies divalent ions, essentially Ca. 2. 2. Si exceeds Al by 0.1 to 0.6 atoms per 9{\AA} cell. Non-cubic (anisotropic and pleochroic) lazurite is common and may be caused by S- 3 ions in parallel orientation. A 'perthitic' composite from Baffin Island has more Cl in the dark isotropic phase, less in the light anisotropic phase. 'Anomalous dispersion' results from absorption at 600 nm. Dark varieties contain more S2- than pale varieties.",

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T1 - New data on lazurite

AU - Hogarth, D. D.

AU - Griffin, W. L.

PY - 1976/1/15

Y1 - 1976/1/15

N2 - New data suggest the following chemical peculiarities of lazurite: 1. 1. The cell (cubic, a=9 A ̊) formula can be expressed as (R′,R′′)7,5-8(Si,Al)12(O,S)24(SO4,H2O,Cl)a·nH2O; R′ signifies monovalent ions, chiefly Na; R′′ signifies divalent ions, essentially Ca. 2. 2. Si exceeds Al by 0.1 to 0.6 atoms per 9Å cell. Non-cubic (anisotropic and pleochroic) lazurite is common and may be caused by S- 3 ions in parallel orientation. A 'perthitic' composite from Baffin Island has more Cl in the dark isotropic phase, less in the light anisotropic phase. 'Anomalous dispersion' results from absorption at 600 nm. Dark varieties contain more S2- than pale varieties.

AB - New data suggest the following chemical peculiarities of lazurite: 1. 1. The cell (cubic, a=9 A ̊) formula can be expressed as (R′,R′′)7,5-8(Si,Al)12(O,S)24(SO4,H2O,Cl)a·nH2O; R′ signifies monovalent ions, chiefly Na; R′′ signifies divalent ions, essentially Ca. 2. 2. Si exceeds Al by 0.1 to 0.6 atoms per 9Å cell. Non-cubic (anisotropic and pleochroic) lazurite is common and may be caused by S- 3 ions in parallel orientation. A 'perthitic' composite from Baffin Island has more Cl in the dark isotropic phase, less in the light anisotropic phase. 'Anomalous dispersion' results from absorption at 600 nm. Dark varieties contain more S2- than pale varieties.

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New data on lazurite

Abstract

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