Occurrence and infrared spectra of holmquistite and hornblende from Mt. Marion, near Kalgoorlie, Western Australia

Wilkins, R. J.; Davidson, Lily; Ross, J. R.

doi:10.1007/bf00388950

Cited by 12 publications

(12 citation statements)

References 4 publications

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“…The strong wavenumber dependence of the absorptivity may explain some earlier results in amphibole IR spectroscopy. For instance, Wilkins et al (1970) noted that the low-wavenumber bands in holmquistite spectra were stronger than expected from random cation distribution. Rowbotham and Farmer (1973) interpreted unexpectedly weak intensities for bands at higher wavenumbers, associated with Na and K on the A-site, as substitution of F and O for OH.…”

Section: Resultsmentioning

confidence: 94%

The intensity of amphibole OH bands in the infrared absorption spectrum

Skogby

Rossman

1991

Phys Chem Minerals

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Abstract. Polarized IR spectra of single-crystals of amphiboles show that the molar absorptivity of the fundamental vibrational OH band is strongly wavenumber dependent. The intensity increases by a factor of 1.6 from 3674 cm -1 (tremolite endmember; MgMgMg) to 3618 cm-1 (grunerite endmember; FeFeFe). Spectra obtained from Ca and Fe-Mg amphiboles consist of sharp, well-resolved bands on a well-defined background. The high intensity of the OH bands in Ca and Fe-Mg amphiboles makes it sometimes necessary to thin the samples to under 2 gm thickness, whereas alkali amphiboles can be measured at 25-50 gm thickness.

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Section: Resultsmentioning

confidence: 94%

The intensity of amphibole OH bands in the infrared absorption spectrum

Skogby

Rossman

1991

Phys Chem Minerals

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“…In general, gedrites have more Fe than anthophyllites and the hydroxyl absorption should be stronger for peaks B and C than for A and D. In practice, low-A1 gedrites give spectra which follow this pattern, though absorption is weaker than in anthopyllites, in hotmquistite (Wilkins et al, 1970;Law and Whittaker, 1981), or in some clinoamphiboles (such as the cummingtonite spectrum referred to earlier). High-A1 gedrites have extremely weak hydroxyl absorption.…”

Section: Introduction To Resultsmentioning

confidence: 85%

Studies of the orthoamphiboles III. Hydroxyl spectra of gedrites

Law

1982

Mineral. mag.

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ABSTRACT. Infra-red spectra of gedrites have been measured in the hydroxyl region (3800 3500 cm-1). The spectra can be related to those of clinoamphiboles and of anthophyllites, and show the normal amphibole pattern of peaks whose intensities reflect the proportions of different cations in the adjacent octahedral sites. The absorption is weak especially in spectra of gedrites high in AI. Hyperfine splitting of peaks has been observed in anthophyllite spectra (Law, 1981) but the extent of hyperfine splitting in gedrite spectra is limited. The underlying baseline absorption, upon which the hydroxyl peaks are superimposed, becomes steeper and more awkward to estimate in gedrites. Some higher frequency peaks, probably arising from unit cells with A sites occupied by Na, are observed.

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“…[1][2][3][4] Holmquistite has a double chain silicate structure within the centres of the ring-shaped holes in the double silicate chain an OH group (which may be partially substituted by F). The free corners of the (Si,Al)O 4 tetrahedra are linked together by cations such as Mg or Fe.…”

Section: Introductionmentioning

confidence: 99%

Near- and Mid Infrared Spectroscopy of the Lithium-Bearing Amphibole Holmquistite from Barraute, Canada

Kloprogge

Duong

Martens

et al. 2006

Journal of Near Infrared Spectroscopy

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The mid-and near infrared spectra of holmquistite, a lithium-containing orthorhombic amphibole, from Barraute (Quebec, Canada) has been measured. The OH stretching region is characterised by bands around 3660, 3645, 3629 and 3613 cm -1 assigned to (3Mg)-OH, (2Mg + Fe 2+ )-OH, (Mg + 2Fe 2+ )-OH and (3Fe 2+ )-OH, respectively. Based on the ratio between the 3645 and 3660 cm -1 bands Fe 2+ /(Fe 2+ + Mg 2+ ) ratios in the M 1 and M 3 sites were determined to be in the range between 0.3 (mid infrared) and 0.4 (Raman). In the near infrared region, two times four bands were observed associated with the four possible combination modes of the four M-OH stretching and bending modes around 4029, 4193, 4323 and 4400 cm -1 and with the four overtones of M-OH stretching modes around 7055, 7091, 7123 and 7155 cm -1 .

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Occurrence and infrared spectra of holmquistite and hornblende from Mt. Marion, near Kalgoorlie, Western Australia

Cited by 12 publications

References 4 publications

The intensity of amphibole OH bands in the infrared absorption spectrum

The intensity of amphibole OH bands in the infrared absorption spectrum

Studies of the orthoamphiboles III. Hydroxyl spectra of gedrites

Near- and Mid Infrared Spectroscopy of the Lithium-Bearing Amphibole Holmquistite from Barraute, Canada

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