Redefinition of angastonite, CaMgAl<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>4</sub> ⋅ 7H<sub>2</sub>O, as an amorphous mineral

to related objects

Abstract 2 (PO4) 2 4 ⋅ 7 H2 O, has been found to correspond to the amorphous phase. A proposal for the redefinition of angastonite as an amorphous phase has been approved by the IMA CNMNC. Amorphous angastonite is isotropic with an index of refraction in the range 1.33 to 1.40 and a measured density of 1.57 (2) g cm- 3. It is formed from incongruent leaching of minyulite in circulating Mg- and Ca-bearing solutions. The amorphous phase undergoes local recrystallisation to form penriceite and two other new crandallite-derivative layer phases. A cluster model for the local structure in the amorphous mineral is proposed based on crandallite-type segments. A brief review of amorphous minerals is given.

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Redefinition of angastonite, CaMgAl2(PO4)2(OH)4 ⋅ 7H2O, as an amorphous mineral ; volume:34 ; number:2 ; year:2022 ; pages:215-221 ; extent:7
European journal of mineralogy ; 34, Heft 2 (2022), 215-221 (gesamt 7)

Creator
Grey, Ian Edward
Elliott, Peter
Mumme, William Gus
MacRae, Colin M.
Kampf, Anthony R.
Mills, Stuart J.

DOI
10.5194/ejm-34-215-2022
URN
urn:nbn:de:101:1-2022041405295698991321
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
15.08.2025, 7:32 AM CEST

Data provider

This object is provided by:
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.

Show object at data provider

Associated

  • Grey, Ian Edward
  • Elliott, Peter
  • Mumme, William Gus
  • MacRae, Colin M.
  • Kampf, Anthony R.
  • Mills, Stuart J.

Other Objects (12)

Batoniite, (Al8(OH)14(H2O)18)(SO4)5&thinsp; ⋅ &thinsp;5H2O, a new mineral with the (Al8(OH)14(H2O)18)10+ polyoxocation from the Cetine di Cotorniano Mine, Tuscany, Italy

Batoniite, (Al<sub>8</sub>(OH)<sub>14</sub>(H<sub>2</sub>O)<sub>18</sub>)(SO<sub>4</sub>)<sub>5</sub>&thinsp; ⋅ &thinsp;5H<sub>2</sub>O, a new mineral with the (Al<sub>8</sub>(OH)<sub>14</sub>(H<sub>2</sub>O)<sub>18</sub>)<sup>10+</sup> polyoxocation from the Cetine di Cotorniano Mine, Tuscany, Italy

Dacostaite, K (Mg2Al)(Mg (H2O)6)2(AsO4)2F6&thinsp; ⋅ &thinsp;2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)

Dacostaite, K (Mg<sub>2</sub>Al)(Mg (H<sub>2</sub>O)<sub>6</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>F<sub>6</sub>&thinsp; ⋅ &thinsp;2H<sub>2</sub>O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)

Karlseifertite, Pb (Ga2Ge)(AsO4)2(OH)6, a new dussertite-group mineral, from Tsumeb, Namibia

Karlseifertite, Pb (Ga<sub>2</sub>Ge)(AsO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>, a new dussertite-group mineral, from Tsumeb, Namibia

Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden

Zinkgruvanite, Ba<sub>4</sub>Mn<sup>2+</sup><sub>4</sub>Fe<sup>3+</sup><sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>2</sub>, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden

Regerite, KFe6(PO4)4(OH)7(H2O)6&thinsp; ⋅ &thinsp;4H2O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany

Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>&thinsp; ⋅ &thinsp;4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany

Surfactant-Encapsulated Clusters (SECs): (DODA)20(NH4)[H3Mo57V6(NO)6O183(H2O)18], a Case Study

Surfactant-Encapsulated Clusters (SECs): (DODA)<sub>20</sub>(NH<sub>4</sub>)[H<sub>3</sub>Mo<sub>57</sub>V<sub>6</sub>(NO)<sub>6</sub>O<sub>183</sub>(H<sub>2</sub>O)<sub>18</sub>], a Case Study

Pleysteinite, ((H2O)0.5K0.5)2Mn2Al3(PO4)4F2(H2O)10&thinsp; ⋅ &thinsp;4H2O, the Al analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Pleysteinite, ((H<sub>2</sub>O)<sub>0.5</sub>K<sub>0.5</sub>)<sub>2</sub>Mn<sub>2</sub>Al<sub>3</sub>(PO<sub>4</sub>)<sub>4</sub>F<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>&thinsp; ⋅ &thinsp;4H<sub>2</sub>O, the Al analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Measurement report: Radiative efficiencies of (CF3)2CFCN, CF3OCFCF2, and CF3OCF2CF3

Measurement report: Radiative efficiencies of (CF<sub>3</sub>)<sub>2</sub>CFCN, CF<sub>3</sub>OCFCF<sub>2</sub>, and CF<sub>3</sub>OCF<sub>2</sub>CF<sub>3</sub>

Heimite, PbCu2(AsO4)(OH)3 ⋅ 2H2O, a new mineral from the Grosses Chalttal deposit, Switzerland

Heimite, PbCu<sub>2</sub>(AsO<sub>4</sub>)(OH)<sub>3</sub> ⋅ 2H<sub>2</sub>O, a new mineral from the Grosses Chalttal deposit, Switzerland

Sb2S3/Sb2Se3 Nanostructures and Applications

Sb<sub>2</sub>S<sub>3</sub>/Sb<sub>2</sub>Se<sub>3</sub> Nanostructures and Applications

Hochleitnerite, (K (H2O)) Mn2(Ti2Fe)(PO4)4O2(H2O)10&thinsp; ⋅ &thinsp;4H2O, a new paulkerrite-group mineral, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Hochleitnerite, (K (H<sub>2</sub>O)) Mn<sub>2</sub>(Ti<sub>2</sub>Fe)(PO<sub>4</sub>)<sub>4</sub>O<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>&thinsp; ⋅ &thinsp;4H<sub>2</sub>O, a new paulkerrite-group mineral, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Fluor-rewitzerite, ((H2O) K) Mn2(Al2Ti)(PO4)4(OF)(H2O)10 ⋅ 4H2O, a new paulkerrite-group mineral, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Fluor-rewitzerite, ((H<sub>2</sub>O) K) Mn<sub>2</sub>(Al<sub>2</sub>Ti)(PO<sub>4</sub>)<sub>4</sub>(OF)(H<sub>2</sub>O)<sub>10</sub> ⋅ 4H<sub>2</sub>O, a new paulkerrite-group mineral, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Related objects