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margarosanite

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Journal Article
Published: 15 February 2021
Mineralogical Magazine (2021) 85 (2): 224–232.
...Dan Holtstam; Fernando Cámara; Andreas Karlsson Abstract The margarosanite group (now officially confirmed by IMA-CNMNC) consists of triclinic Ca-(Ba, Pb) cyclosilicates with three-membered [Si 3 O 9 ] 6– rings (3R), with the general formula AB 2 Si 3 O 9 , where A = Pb, Ba and Ca and B = Ca...
FIGURES | View All (6)
Journal Article
Published: 01 January 2013
European Journal of Mineralogy (2013) 25 (1): 71–77.
...Michael Gaft; H Yeates; Lev Nagli Abstract Visual luminescence of natural margarosanite, swedenborgite and walstromite is well known for mineralogists, but their spectral characteristics and interpretation were still missing. We studied those minerals by laser-induced time-resolved luminescence...
FIGURES | View All (7)
Journal Article
Published: 01 June 1964
American Mineralogist (1964) 49 (5-6): 781–782.
...F. P. Glasser; L. S. Dent Glasses Abstract Armstrong (1963) has reported crystal data on margarosanite, (Ca, Mn) 2 PbSi 3 O 9 . The present authors have determined a unit cell in essential agreement with Armstrong's using material furnished by the Smithsonian Institution, U. S. National Museum...
Journal Article
Published: 01 June 1963
American Mineralogist (1963) 48 (5-6): 698–703.
...Richard Lee Armstrong Abstract Margarosanite was first described by Ford and Bradley (1916) on the basis of a chemical analysis and partial physical data. The specimens studied (Brush Collection No. 5938) were collected in 1898 from the Parker Shaft, North Mine Hill, Franklin, New Jersey and were...
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SEM-BSE image, detail of  Fig 1 . Arrow points to a phase with <b>margarosanit</b>...
Published: 15 February 2021
Fig. 2. SEM-BSE image, detail of Fig 1 . Arrow points to a phase with margarosanite end-member composition (GEO-NRM catalogue #19940358).
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Raman spectra of walstromite, swedenborgite and <b>margarosanite</b>.
Published: 01 January 2013
Fig. 2 Raman spectra of walstromite, swedenborgite and margarosanite.
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SEM-BSE image of the mineral assemblage in sample GEO-NRM #19940358, with w...
Published: 15 February 2021
Fig. 1. SEM-BSE image of the mineral assemblage in sample GEO-NRM #19940358, with walstromite–margarosanite (Wal), celsian (Cls), phlogopite (Phl), andradite (Adr) and nasonite (Nas).
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Chemical variation Ba  vs . Pb in walstromite–<b>margarosanite</b> based on EDS an...
Published: 15 February 2021
Fig. 4. Chemical variation Ba vs . Pb in walstromite–margarosanite based on EDS analyses. The linear regression line ( R 2 = 0.99) verifies the binary solid solution.
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The ‘layer’ of 3-membered rings of SiO 4  tetrahedra in <b>margarosanite</b> (a) a...
Published: 15 February 2021
Fig. 5. The ‘layer’ of 3-membered rings of SiO 4 tetrahedra in margarosanite (a) and the relative position of sites occupied by Ca ( Ca 1 and Ca 2) and by Pb(Ba) ( Ca 3) (b). Figures obtained with Vesta 3.0 (Momma and Izumi, 2011 ).
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Chemical formulae and crystallographic data for <b>margarosanite</b>-group members...
Published: 15 February 2021
Table 4. Chemical formulae and crystallographic data for margarosanite-group members (natural samples). Triclinic symmetry, space group P 1 and Z = 2. Margarosanite 1 Walstromite 2 Breyite 3 Walstromite 4 Chemical formulae PbCa 2 Si 3 O 9 BaCa 2 Si 3 O 9 CaCa 2 Si 3
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Visual luminescence of <b>margarosanite</b> (upper), walstromite (middle) and swed...
Published: 01 January 2013
Fig. 1 Visual luminescence of margarosanite (upper), walstromite (middle) and swedenborgite (down) under UV lamp excitation.
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Laser-induced time-resolved luminescence of <b>margarosanite</b> under excitation ...
Published: 01 January 2013
Fig. 3 Laser-induced time-resolved luminescence of margarosanite under excitation by 355 nm wavelength: with zero delay and broad gate at 300 (a) and 100 (b) K, with zero delay and narrow gate at 100 K (c) and decay time of orange luminescence at 300 and 100 K (d).
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Laser-induced time-resolved luminescence of <b>margarosanite</b> under excitation ...
Published: 01 January 2013
Fig. 4 Laser-induced time-resolved luminescence of margarosanite under excitation by 266 nm wavelength: at 300 K with intermediate delay and broad gate (a) and zero delay and narrow gate (b), at 200 K with intermediate delay and broad gate (c) and zero delay and narrow gate (d), at 100 K
Journal Article
Published: 01 April 2021
Mineralogical Magazine (2021) 85 (2): b1–b2.
.... PUSHCHAROVSKY : New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XV. Calciojohillerite, NaCaMgMg2(AsO4)3, a member of the alluaudite group 215 DAN HOLTSTAM, FERNANDO CÁMARA and ANDREAS KARLSSON : Instalment of the margarosanite group, and data on walstromite...
Journal Article
Published: 01 December 1984
American Mineralogist (1984) 69 (11-12): 1173–1179.
... similar to the rings in paragenetically related margarosanite, PbCa 2 [Si 3 O 9 ], Coordination polyhedra include Pb ϕ 7 (maximal point symmetry mm 2); Ca(1) ϕ 8 distorted square antiprisms; Ca(2) ϕ 7 polyhedra similar to Pb ϕ 7 ; MnO 6 octahedra; SiO 4 , SO 4 tetrahedra. Mean bond distances are: Pb–O...
Journal Article
Published: 01 February 1968
American Mineralogist (1968) 53 (1-2): 231–240.
... 7 , esperite (Ca,Pb) 4 Zn 4 Si 4 O 16 , margarosanite Ca 2 PbSi 3 O 9 , phase X 1 CaPb 2 Zn 3 Si 3 O 12 , phase X 2 (possibly a high temperature polymorph of nasonite Ca 2 Pb 3 Si 3 O 11 ) and phase X 3 (probable formula, CaZnSi 2 O 6 ·H 2 O). X-ray powder data of the new phases are recorded...
Journal Article
Published: 01 January 1927
American Mineralogist (1927) 12 (1): 10–14.
... it is not a metasilicate; Hintze 2 includes jadeite as a triclinic pyroxene, but other authors agree that it is monoclinic; Groth 3 adds schizolite and margarosanite to the triclinic pyroxenes, but their crystallographic angles and constants differ decidedly from those of any pyroxenes.Washington and Merwin 4 add...
Journal Article
Published: 01 August 2020
Mineralogical Magazine (2020) 84 (4): 623–627.
... 6+ 3 O 14 (OH) 4 ⋅6H 2 O The margarosanite group is established and includes the three isostructural members: margarosanite, walstromite and breyite. The pascoite family is established and consists of 20 V minerals. The family consists of the pascoite and lasalite groups as well...
Journal Article
Published: 01 August 2004
The Canadian Mineralogist (2004) 42 (4): 1037–1045.
... BaTi[Si3O9] . Z. Kristallogr . 129 , 222 – 243 . Freed , R.L. & Peacor , D.R. ( 1969 ): Determination and refinement of the crystal structure of margarosanite, PbCa2Si3O9 . Z. Kristallogr . 128 , 213 – 218 . Gaines , R.V. , Skinner , H.C.W. , Foord , E.E...
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Selected interatomic distances (Å), angles (°), tetrahedral angle variances...
Published: 15 February 2021
Table 3. Selected interatomic distances (Å), angles (°), tetrahedral angle variances (TAV, ° 2 ) and quadratic elongations (TQE) according to Robinson et al. ( 1971 ) for walstromite–margarosanite. Si 1–O1 1.599(4) Si 2–O4 1.684(3) Si 3–O3 1.666(3)     Si 1–O2 1.591(3