IMA 2015-100 = kannanite

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Marco E. Ciriotti
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IMA 2015-100 = kannanite

Messaggio da Marco E. Ciriotti » lun 05 nov, 2018 21:20

Prossima pubblicazione.

Referenza:
▪ Nishio-Hamane, D., Nagashima, M., Ogawa, N., Minakawa, T. (2018): Kannanite, a new mineral from Kannan Mountain, Japan. Journal of Mineralogical and Petrological Sciences, 113, (in press).

Abstract:
Kannanite, a new Ca–dominant member of the ardennite series, was obtained from Kannan Mountain, Ozu, Ehime Prefecture, Japan. Kannanite occurs in fine quartz veins crossing the hematite–rich regions of an iron–manganese ore included in the metachert. These veins are pale orange in color, while the kannanite itself is brownish–orange to orange, with a thin section exhibiting weak pleochroism. The mineral was found in grain sizes ranging from several to 15 µm and has a Mohs hardness of 6 and a calculated density of 3.43 g cm−3. The mean refractive index obtained from the Gladstone–Dale relationship for this mineral is 1.788. The empirical formula for kannanite is
(Ca3.60Mn2+0.40)Σ4(Al3.00Mn3+1.31Fe3+0.69Mg0.71Mn2+0.19Ni0.06Cu0.05)Σ6[(V5+0.70Si0.16As0.14)Σ1O3.84(OH)0.16](SiO4)2(Si3O10)(OH)6,
while the simplified formula is Ca4[(Al,Mn3+,Fe3+)5Mg] (VO4)(SiO4)2(Si3O10)(OH)6. Kannanite has an orthorhombic structure with a space group Pnmm and unit cell parameters a = 8.8802(14) Å, b = 5.9919(13) Å, c = 18.882(3) Å and V = 1004.7(3) Å3. Kannanite is considered to be formed by the activities of metamorphic fluid accompanied with the Sanbagawa metamorphism.
Marco E. Ciriotti

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Roberto Bracco
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Re: IMA 2015-100 = kannanite

Messaggio da Roberto Bracco » mar 06 nov, 2018 9:26

Un altro minerale che da noi ci sta...
Roberto Bracco - AMI Liguria

Perché seguire il calcio, quando accanto c'è lo scandio e poco più in là il vanadio?

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Marco E. Ciriotti
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Re: IMA 2015-100 = kannanite

Messaggio da Marco E. Ciriotti » mar 06 nov, 2018 9:53

La struttura cristallina della nuova specie è irrisolta e pertanto quello che aggiungo potrebbe essere un pochino azzardato, ma la kannanite dovrebbe essere l'analogo di calcio della ardennite-(V).

ardennite group

Alpeite Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
Ardennite-(As) Mn2+4Al2Al2(MgAl)(As5+O4)(SiO4)2(Si3O10)(OH)6
Ardennite-(V) Mn2+4Al2Al2(MgAl)(V5+O4)(SiO4)2(Si3O10)(OH)6
Kannanite Ca4Al2Al2(MgAl)(V5+O4)(SiO4)2(Si3O10)(OH)6
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2015-100 = kannanite

Messaggio da Marco E. Ciriotti » mar 11 dic, 2018 2:53

Pubblicazione effettuata.

Referenza:
▪ Nishio-Hamane, D., Nagashima, M., Ogawa, N., Minakawa, T. (2018): Kannanite, a new mineral from Kannan Mountain, Japan. Journal of Mineralogical and Petrological Sciences, 113, 245-250.

Abstract:
Kannanite, a new Ca–dominant member of the ardennite series, was obtained from Kannan Mountain, Ozu, Ehime Prefecture, Japan. Kannanite occurs in fine quartz veins crossing the hematite–rich regions of an iron–manganese ore included in the metachert. These veins are pale orange in color, while the kannanite itself is brownish–orange to orange, with a thin section exhibiting weak pleochroism. The mineral was found in grain sizes ranging from several to 15 µm and has a Mohs hardness of 6 and a calculated density of 3.43 g cm−3. The mean refractive index obtained from the Gladstone–Dale relationship for this mineral is 1.788. The empirical formula for kannanite is
(Ca3.60Mn2+0.40)Σ4(Al3.00Mn3+1.31Fe3+0.69Mg0.71Mn2+0.19Ni0.06Cu0.05)Σ6[(V5+0.70Si0.16As0.14)Σ1O3.84(OH)0.16](SiO4)2(Si3O10)(OH)6,
while the simplified formula is Ca4[(Al,Mn3+,Fe3+)5Mg](VO4)(SiO4)2(Si3O10)(OH)6. Kannanite has an orthorhombic structure with a space group Pnmm and unit cell parameters a = 8.8802(14) Å, b = 5.9919(13) Å, c = 18.882(3) Å and V = 1004.7(3) Å3. Kannanite is considered to be formed by the activities of metamorphic fluid accompanied with the Sanbagawa metamorphism.

NdR: nel lavoro nessun cenno all'alpeite, Ca4Mn3+2Al2(Mn3+Mg)(V5+O4)(SiO4)2(Si3O10)(OH)6, che ci certo ha affinità con questa nuova specie!
Marco E. Ciriotti

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