The lead silicates from Franklin, New Jersey: occurrence and composition

Dunn, Pete J.

doi:10.1180/minmag.1985.049.354.12

Cited by 13 publications

(14 citation statements)

References 9 publications

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“…BARYSILITE is a rare PbMn silicate rst described by Sjögren and Lundström (1888) from the Harstigen mine, Filipstad, Värmland, Sweden. Later, it was also reported from the famous deposits La Ê ngban and Jakobsberg (both Filipstad, Sweden) and from Franklin, New Jersey, USA (Ito and Frondel, 1967;Dunn, 1985;Yeates, 1991, and references therein). Another occurrence of the mineral as minute tabular crystals, partly in association with cerussite, in a mining slag at the Glü cksrad mine, Oberschulenberg, Harz mountains, Germany (Schellhorn, 1987;Wittern, 1994) is noteworthy.…”

Section: Introductionmentioning

confidence: 88%

“…At Franklin, New Jersey, barysilite is accompanied by willemite, hardystonite, nasonite (often in intimate association), ganomalite, margarosanite, manganaxinite and andradite (Shannon and Berman, 1926;Ito and Frondel, 1967;Dunn, 1985;Yeates, 1991). At La Ê ngban, the mineral was observed in association with barylite, manganoan diopside and garnet, but also in ssures and veins within cymrite-kentrolite and richterite-jacobsite skarns (Nysten et al, 1999), while at Harstigen, barysilite occurs associated with calcite and hedyphane in ssures hosted by garnet-tephroite skarns (Sjögren and Lundström, 1888).…”

Section: Conditions Of Formation Of Barysilitementioning

confidence: 99%

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Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Kolitsch¹,

Holtstam²

2002

Mineral. mag.

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A new occurrence of barysilite, PbxMn(Si207h, at the polymetallic Garpenberg Norra Zn-Pb deposit, Hedemora. Dalarna, Sweden, is described. The mineral, which forms colourless, transparent grains, is characterized by X-ray diffraction and electron-microprobe analyses. The assemblage includes tephroite, zincian jacobsite, manganoan diopside and others. The crystal structure of a barysilite crystal from Garpenberg Norra was redetermined using single-crystal X-ray diflraction data (Mo-Kex, CCO area detector) and has been refined in space group R3c with a = 9.804( I), c = 38.416(8) A, V = 3197.8(8) A', to RI = 2.32% for 1025 'observed' reflections with Fo >4a(Fo)' A previous, lowprecision structure determination (Lajzerowicz, 1965; R = 20%) is confirmed but improved considerably.The structure contains one dist011ed MnO(, polyhedron with six equivalent Mn-O bonds (2.224 A), one Si207 disilicate unit with an Si-O-Si angle of 120.9', and two non-equivalent Pb sites. The Pb I site has a highly irregular, one-sided coordination with six 0 ligands, indicating a stereoactive 6.1'2lone-electron pair on the Pb2-ion, whereas the [6+ 3]-coordinated Pb2 site is fairly regular, with Pb-O distances of 2.540 (3 x), 2.674 (3 x) and 3.098 (3 x ) A.. The Pb2 site contains -10% of Ca (+Ba) replacing Pb, corresponding to the structural formula Pb 16(Pb,Ca)22Mn(Si207h. This is the first direct proof that not only the M site in barysilite-type PbxM(Si207 h compounds can be replaced by divalent cations.

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Section: Introductionmentioning

confidence: 88%

Section: Conditions Of Formation Of Barysilitementioning

confidence: 99%

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Kolitsch¹,

Holtstam²

2002

Mineral. mag.

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“…Penfield & Warren (1899) named a Pb-rich monoclinic epidote-group mineral discovered at Franklin, N.J., USA after Elwood P. Hancock (1836Hancock ( -1916 of Burlington, N.J., a collector of Franklin minerals. At the type locality the mineral contains appreciable amounts of Sr, and of Mn 3+ , the latter being responsible for the strong red color (Dunn, 1985). Holtstam & Langhof (1994) , is related to clinozoisite but with Ca on the A2 site substituted by Sr (shown by singlecrystal X-ray structure refinement).…”

Section: Hancockite and Niigataitementioning

confidence: 99%

Recommended nomenclature of epidote-group minerals

Armbruster

Bonazzi

Akasaka

et al. 2006

ejm

258

170

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The key cation-sites M3 and A1 (and, in principle, M2) determine the root name. In both clinozoisite and allanite subgroups no prefix is added to the root name if M1 = Al. The prefixes ferri, mangani, chromo, and vanado indicate dominant Fe 3+ , Mn 3+ , Cr 3+ , and V 3+ on M1, respectively. In the dollaseite subgroup no prefix is added to the root name if M1 = Mg. Otherwise a proper prefix must be attached; the prefixes ferro and mangano indicate dominant Fe 2+ and Mn 2+ at M1, respectively. The dominant cation on A2 (other than Ca) is treated according to the Extended Levinson suffix designation. This simple nomenclature requires renaming of the following approved species: Niigataite (old) = clinozoisite-(Sr) (new), hancockite (old) = epidote-(Pb) (new), tweddillite (old) = manganipiemontite-(Sr) (new). Minor modifications are necessary for the following species: Strontiopiemontite (old) = piemontite-(Sr) (new), androsite-(La) (old) = manganiandrosite-(La) (new). Before a mineral name can be assigned, the proper subgroup has to be determined. The determination of a proper subgroup is made by the dominating valence at M3, M1, and A2 expressed as M 2+ and or M 3+ , not by a single, dominant ion (i.e., Fe 2+ , or Mg, or Al). In addition, the dominant valence on O4: X -or X 2-must be ascertained. The dominant trivalent cation on M3 determines the name, whereas the A2 cation appearing in the suffix has to be selected from among the divalent cations. (2) Allanite and dollaseite subgroups: For the sites involved in the charge compensation of a heterovalent substitution in A2 and O4 (i.e. M3 in the allanite subgroup; M3 and M1 in the dollaseite subgroup), identification of the relevant end-member formula must take into account the dominant divalent charge-compensating octahedral cation (M 2+ ) and not the dominant cation in these sites.Formal guidelines and examples are provided in order to determine a mineral "working name" from electron-microprobe analytical data.

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“…Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence HANCOCKITE, CaPbA12Fe(SiO4)3(OH), the plumboan member of the epidote group is to date only reported from its type locality at Franklin, New Jersey (Penfield and Warren, 1899), where it appears in a rather restricted part of the mine, but locally in abundance, associated with andradite, franklinite, manganaxinite, willemite, barite and other minerals (Palache, 1935;Dunn, 1985). [The 'hancockite' reported by Neumann (1985) from Vestpolltind, Lofoten, Norway, does not qualify for the name as it is too low in Pb (~10% PbO).]…”

mentioning

confidence: 99%

“…From the calculated formula (Table 1), the epidote under study approaches the idealized end-member CaPbAI2Fe(SiO4)3(OH). In the analytical data of Franklin hancockites given by Dunn (1985), the most lead-rich sample contains only 0.80 Pb p.f.u. The crystal-chemistry of the epidote group, revealed by many detailed X-ray investigations, including some of hancockite (Dollase, 1971) and of strontian members of the group (Catti et al, 1989;Bonazzi et al, 1990) is the basis for the assumed end-member composition.…”

mentioning

confidence: 99%