Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan

Murakami, Naotoshi; Katō, Takako; Miúra, Y.; Hirowatari, Fumitoshi

doi:10.2465/minerj.8.110

Cited by 25 publications

(9 citation statements)

References 5 publications

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“…The issue of what affects the relative chemical stabilities of specific bond topologies is one that challenges our understanding of structure stability and deserves serious consideration in the future. Pautov and Agakhanov (1997); (5) White et al (1973), Armbruster and Oberhänsli (1988b); (6) Velde et al (1989); (7) Semenov et al (1975), Ferraris et al (1999); (8) Pautov et al (1996), Sokolova and Pautov (1995); (9) Abraham et al Grice et al (1987); (18) Fuchs et al (1966), Hentschel et al (1980), Armbruster (1989); (19) Pautov et al (1998), Sokolova et al (1999); (20) Dusmatov et al (1968), Cooper et al (1999), Sokolova et al (2000); (21) Murakami et al (1976), Kato et al (1976); (22) Postl et al (2004); (23) Bunch and Fuchs (1969). a Omitting (H 2 O) in the channels.…”

Section: Discussionmentioning

confidence: 95%

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Hawthorne

Abdu

Ball

et al. 2014

American Mineralogist

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Agakhanovite-(Y), ideally (YCa)o 2 KBe 3 Si 12 O 30 , is a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, southern Norway. Crystals are prismatic along [001], and show the forms {100} and {100}. Agakhanovite-(Y) is colorless with a white streak and a vitreous luster, and does not fluoresce under ultraviolet light. There is no cleavage or parting, and no twinning was observed. Mohs hardness is 6, and agakhanovite-(Y) is brittle with a conchoidal fracture. The calculated density is 2.672 g/cm 3 . Optical properties were measured with the Bloss spindle stage for the wavelength 590 nm using a gel filter. Agakhanovite-(Y) is uniaxial (-) with indices of refraction w = 1.567, e = 1.564, both ±0.002; the calculated birefringence is 0.003 and it is non-pleochroic. Agakhanovite-(Y) is hexagonal, space group P6/mcc, a = 10.3476(2), c = 13.7610(3) Å, V = 1276.02(9) Å 3 , Z = 2, c:a = 1.330. The seven strongest lines in the X-ray powder-diffraction pattern are as follows: d (Å), I, (hkl): 2.865, 100, (124); 3.287, 96, (131); 4.134, 84, (122); 6.877, 56, (002); 2.986, 43, (030); 4.479, 38, (020); 2.728, 36, (024). Chemical analysis by electron microprobe gave SiO 2 69.56, Al 2 O 3 0.35, Y 2 O 3 9.69, Yb 2 O 3 0.15, FeO 0.02 CaO 5.75, Na 2 O 0.07, K 2 O 4.52, BeO(calc) 7.06, H 2 O(calc) 1.74, sum 98.91 wt%. The H 2 O content was determined by crystal-structure analysis. On the basis of 30 anions, the empirical formula is (Y 0.89 Yb 0.01 Ca 1.06 ) S1.96 (H 2 O) 0.92 Na 0.02 K 1.00 (Be 2.93 Al 0.07 ) S3.00 Si 12.02 O 30 . The crystal structure of agakhanovite-(Y) was refined to an R 1 index of 1.9% based on 660 unique observed reflections collected on a three-circle rotating-anode (MoKa X-radiation) diffractometer equipped with multilayer optics and an APEX-II detector. In the end-member structure of agakhanovite-(Y), the A site is occupied equally by Y and Ca, and the B site is vacant; agakhanovite-(Y) is the Y-analog of oftedalite: ScCao 2 KBe 3 Si 12 O 30 , and the Y-Ca-Be analog of klöchite, (Fe 2+ Fe 3+ )o 2 KZn 3 Si 12 O 30 .

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Section: Discussionmentioning

confidence: 95%

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Hawthorne

Abdu

Ball

et al. 2014

American Mineralogist

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“…Atomic AI-EFe-EMn diagram for sugilite from various localities. Data sources: Cerchiara (Cabella et al, 1990), Furumiya (Hirowatari and Fukuoka 1988), Hoskins (820993 and 820994, this paper), Iwagi (Murakami et al, 1976), Madhya Pradesh (Clark et al, 1980), Wessels (Dunn et al, 1980;Dixon, 1985Dixon, , 1989Armbruster et al, 1993), and Woods cores and rims (OU63701, this paper). Two analyses (Nos.…”

Section: : Mn 3 §mentioning

confidence: 99%

“…According to Armbruster and Oberhiinsli (1988), it has an ideal formula of Na2K(Fe 3 +,Mn 3 +,Al)2Li3Sit2030. Careful analyses of sugifite and other members of the milarite group, however, often show the presence of water (Murakami et aL, 1976;Kato et al, 1976;Cern~ et al, 1980). It has subsequently been recorded from metamorphosed manganese silicate-oxide rocks (Dunn et al, 1980;Clark et al, 1980;Dixon, 1985Dixon, , 1989Hirowatari and Fukuoka, 1988;Cabella et aL, 1990;Armbruster et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

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Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia

et al. 1994

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Sugilite relatively rich in manganese has been found at two new localities, the Hoskins and Woods mines in New South Wales, Australia. The occurrences are in manganese-rich silicate rocks of middle to upper greenschist facies (Hoskins mine) and hornblende hornfels facies (Woods mine). Coexisting minerals are members of the namansilite-aegirine and pectolite-serandite series, Mn-rich alkali amphiboles, alkali feldspar, braunite, rhodonite, tephroite, albite, microcline, norrishite, witherite, manganoan calcite, quartz, and several unidentified minerals. Woods mine sugilite is colour-zoned with pale mauve cores and colourless rims, whereas Hoskins mine sugilite is only weakly colour-zoned and pink to mauve. Within single samples, the chemical compositions of sugilite from both localities show wide ranges in A1 contents and less variable ranges of Fe and Mn, similar to trends in sugilite from other localities. The refractive indices and cell dimensions tend to show systematic increases progressing from Al-rich to FeMn-rich. The formation of the sugilite is controlled by the high alkali (especially Li) and manganese contents of the country rock, reflected in the occurrences of coexisting high alkali-and manganesebearing minerals, and by high fo2 conditions.

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“…Thus, "alumino-" is added as prefix in accordance with the guideline on mineral nomenclature of the IMA Commission (Nickel and Grice, 1998), especially on the use of prefixes and suffixes (Hey and Gottardi, 1980). Sugilite was named by Murakami et al (1976) in honour of late Ken-ichi Sugi (1901-1948 of the Kyushu Imperial University, who first found the occurrence of sugilite on the Iwagi Islet, Ehime, Japan, representing the type locality of sugilite. The type specimen of aluminosugilite will be deposited in the National Museum of Nature and Science, Tsukuba, Japan, under the specimen number NSM- MF-16503 (holotype).…”

Section: Introductionmentioning

confidence: 99%

Aluminosugilite, KNa2Al2Li3Si12O30, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy

Nagashima

Fukuda²,

Matsumoto

et al. 2020

Eur. J. Mineral.

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Abstract. Aluminosugilite (IMA2018-142), ideal formula KNa2Al2Li3Si12O30, is a new mineral that was found in the interstices in manganiferous metacherts from the Cerchiara mine, Liguria, Italy. Aluminosugilite is an Al analogue of sugilite belonging to the milarite group. It occurs as aggregates of small prismatic and/or granular crystals up to 1 mm in length, and it is pinkish-purple with a pale purple to white streak and a vitreous lustre. It has a Mohs hardness of 6–6.5. Its cleavage is indistinct, poor on (0001). Measured and calculated densities are Dmeas.=2.71–2.72 g cm−3 and Dcalc.=2.73 g cm−3, respectively. Aluminosugilite is optically uniaxial (–), with ω=1.577–1.586 and ε=1.575–1.585, with a weak pleochroism. The magnetic susceptibility is lower than that for sugilite. Aluminosugilite is insoluble in HCl, HNO3 and H2SO4, like sugilite. The empirical formula of aluminosugilite calculated on the basis of O =30 from the result obtained by electron microprobe analysis and laser-induced breakdown spectroscopy is K0.99Na1.99(Al1.38Mn0.313+Fe0.243+Ti0.05Mg0.01)Σ1.99Li3.06Si11.99O30. Structure refinement converged to R1=2.17 %. Its space group is hexagonal P6∕mcc, with unit-cell parameters a=9.9830(4) Å, c=13.9667(5) Å and V=1205.45(7) Å3. Based on the refined site occupancies, the ideal structural formula of aluminosugilite is CKBNa2AAl2T2Li3T1Si12O30. The variation of the A–O3 distance is governed by the cationic substitution at the A site. The a and c dimensions of aluminosugilite are shorter than those of sugilite due to Al substitution for Fe3+ at the A site.

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Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan

Cited by 25 publications

References 5 publications

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia

Aluminosugilite, KNa<sub>2</sub>Al<sub>2</sub>Li<sub>3</sub>Si<sub>12</sub>O<sub>30</sub>, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy

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Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan

Cited by 25 publications

References 5 publications

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Agakhanovite-(Y), ideally (YCa) 2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: Description and crystal structure

Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia

Aluminosugilite, KNa&lt;sub&gt;2&lt;/sub&gt;Al&lt;sub&gt;2&lt;/sub&gt;Li&lt;sub&gt;3&lt;/sub&gt;Si&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;30&lt;/sub&gt;, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy

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Aluminosugilite, KNa<sub>2</sub>Al<sub>2</sub>Li<sub>3</sub>Si<sub>12</sub>O<sub>30</sub>, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy