Harkerite from the Alban Hills, Italy

Barbieri, M. Adelaide; Cozzupoli, Domenico; Federico, M.; Fornaseri, M.; Merlino, Stefano; Orlandi, Paolo; Tolomeo, L.

doi:10.1016/0024-4937(77)90040-8

Cited by 8 publications

(9 citation statements)

References 8 publications

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“…Giuseppetti et al (1977) Aside from the complexborate-aiuminosflicate substitution, the other most notable aspect of this Kombat sakhaite is the apparent high water content, which is released at relatively high temperatures. Although we have calculated the above formula in accordance with the most recent structure determination, we agree with Barbieri et al (1977) that few sakhaites approach this compo-P. J. DUNN ETAL. sition; most have CI, which is unaccounted for in the structural formula, and all have less water (or hydroxyl) than the Kombat material.…”

Section: Chemical Compositionsupporting

confidence: 64%

“…sition; most have CI, which is unaccounted for in the structural formula, and all have less water (or hydroxyl) than the Kombat material. Most sakhaites have approximately 26-28 boron atoms per cell, as does the Kombat material, which extends the known aluminosilicates substitution within the sakhaite symmetry beyond that given by Barbieri et al (1977).…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Their structural formula of sakhaite, determined on synthetic material, is CaznMgs(BO3)s(BO3)8 (CO3)s. H20, for the end-member. However, few sakhaites conform to this idealized formula (Barbieri et al, (1977). Giuseppetti et al (1977) Aside from the complexborate-aiuminosflicate substitution, the other most notable aspect of this Kombat sakhaite is the apparent high water content, which is released at relatively high temperatures.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…However, we note that Chichagov et al (1974) refined the crystal structure of a 'synthetic sakhaite' in space group F4132, a sub-group of Fd3m. Furthermore, Barbieri et al (1977) reported that harkerite from Albano, Italy, is cubic with a= 14.82 and has space group Fm3m, F432, or F$3rn. The latter is a subgroup of Fd3m and therefore also consistent with the diffraction relations of this study.…”

Section: X-ray Crystallographymentioning

confidence: 99%

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A sakhaite-like mineral from the Kombat Mine in Namibia

et al. 1990

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Sakhaite from the Kombat Mine in Namibia is cubic, with a= 14.749(1)A; the space group is a subgroup of Fd3m, the density is 2.88 g/cm 3, and the index of refraction is n = 1.642(2). It is apparently more highly hydrated than previously described sakhaite, and has more aluminosilicate substitution. The idealized composition is Ca24Mgs(BO3)8[(BO3)y(A1Si4(O,OH)<16}x](CO3)s.< 8H:O with x = 0.73 andy =5.0.

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Section: Chemical Compositionsupporting

confidence: 64%

Section: Chemical Compositionmentioning

confidence: 99%

Section: Chemical Compositionmentioning

confidence: 99%

Section: X-ray Crystallographymentioning

confidence: 99%

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A sakhaite-like mineral from the Kombat Mine in Namibia

et al. 1990

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“…Harkerite is a rare borosilicate carbonate typically found in high-temperature, low pressure, calcsilicate skarns [3,59]. Harkerite was first identified at Cascade Slide in the Adirondack Highlands by Figure 9.…”

Section: Harkerite Ca12mg4al(bo3)3(sio4)4(co3)5•h2omentioning

confidence: 99%

A Review of Boron-Bearing Minerals (Excluding Tourmaline) in the Adirondack Region of New York State

et al. 2019

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Boron is a biologically important element, but its distribution in the natural environment and its behavior during many geological processes is not fully understood. In most metamorphic and igneous environments, boron is incorporated into minerals of the tourmaline supergroup. In high-grade metamorphic terranes like that of the Adirondack region of northern New York State, uncommon rock compositions combined with unusual and variable geologic conditions resulted in the formation of many additional boron-bearing minerals. This paper reviews the occurrences and geological settings of twelve relatively uncommon boron-bearing minerals in the southern Grenville Province of upstate New York and provides new chemical and Raman spectral data for seven of these minerals. The boron minerals range from relatively simple metal borates (e.g., vonsenite), to chemically complex borosilicates (e.g., prismatine), to a relatively rare borosilicate-carbonate (e.g., harkerite). Some are of primary igneous origin, while others are formed by a variety of prograde and retrograde metamorphic processes or by metasomatic/hydrothermal processes. Most of the boron minerals are formed within, or adjacent to, metasedimentary lithologies that surround the anorthositic massifs of the central Adirondacks. The metasedimentary rocks are thought to be the source of most of the boron, although additional boron isotope studies are needed to confirm this and to constrain the mechanisms of the formation of these unusual minerals.

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Contact metasomatic and hydrothermal minerals in the SH2 deep well, Sabatini volcanic district, Latium, Italy

Cavarretta

Tecce

1987

Geothermics

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Harkerite from the Alban Hills, Italy

Cited by 8 publications

References 8 publications

A sakhaite-like mineral from the Kombat Mine in Namibia

A sakhaite-like mineral from the Kombat Mine in Namibia

A Review of Boron-Bearing Minerals (Excluding Tourmaline) in the Adirondack Region of New York State

Contact metasomatic and hydrothermal minerals in the SH2 deep well, Sabatini volcanic district, Latium, Italy

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