Appendix I

Sample details

166405 Manzano Plain, Caracas, Venezuela.U.S. National Museum. See Hess et al. (1952). Same locality as Faust and Fahey (1962) sample 120 (their Fig. 17). Pale green, monomineralic, massive antigorite rock (trace of dusty fibers <1%). Antigorite in bladed aggregates, up to 1-mm long crystals, some much finer. Very clean. m = 17.

R070228 Wood’s Chrome Mine, Lancaster Co., Pennsylvania.U.S. National Museum. Same locality as Faust and Fahey (1962) sample 153, described as picrolite.

82509 Tilley Foster mine, Brewster Station, Putnam County, NY.U.S. National Museum. Several analyses in Faust and Fahey (1962). Apple-green antigorite flakes with chrysotile fibers in between (Cressey et al. 1993). Associated minerals according to Aumento (1967) are magnesite, chondrodite, magnetite, and chlorite. Also pyrrhotite, dolomite, and calcite in our sample. m = 16 (Aumento 1967; Cressey et al. 1993). Antigorite is believed to be a pseudomorph after something like anhydrite. Associated with magnetite ore hosted in metamorphosed dolomitic limestone.

66586 Afghanistan.Natural History Museum, London. Described as bowenite (very pale green gem quality nephritic antigorite). See also Faust and Fahey (1962) sample 150.

94-NZ-62 Griffin Range, Westland, New Zealand.From R.G. Coleman. See Page and Coleman (1967). Interlocking matte of 1 mm antigorite laths perpendicular to each other, with magnesite and minor opaques. See also Coleman (1966).

38-NZ-62 Milford Sound, South Island, New Zealand.From R.G. Coleman. 1 cm parallel flakes of antigorite in vein in dunite mylonite. Traces of talc, magnesite, and magnetite. m = 17 (Eggler and Ehmann 2010)

75-32 Lagi Marmorera, Oberhalbstein, E. Switzerland.For this and 75-34 see Dietrich (1972a, 1972b). Antigorite rock with accessory diopside, chlorite, magnetite, ilvaite, and sulfides. Mineralized meta-ophiolite.

75-34 Lagi Marmorerea, Oberhalbstein, E. Switzerland.Dark green cross-fiber vein of antigorite, cutting meta-ophiolite. m = 17 (Dietrich 1972a). Mineralized meta-ophiolite.

A1, A5 Sasaguri, Kyushu, Japan.Donated by S. Uehara. See Uehara and Shirozu (1985), Uehara (1998), and Evans and Kuehner (2011). Massive antigorite rocks. m = 14 (A1) and 16 (A5).

N7 Nishisogoni, Japan. Donated by S. Uehara. Massive pure antigorite rock. m = 14

Mg 47 Franscia, Sondrio, N. Italy, in Malenco olivine-serpentinite. Collected by BWE. Accessories diopside, chlorite, magnetite, pentlandite, and awaruite. Probably m = 17 (Mellini et al. 1987).

Mg 159c Franscia, Sondrio, N. Italy, in Malenco olivine-serpentinite. Accessories diopside, chlorite, magnetite, brucite, awaruite, heazlewoodite. m = 17, Fe3+/Fe = 0.147 (Peretti et al. 1992). Also Capitani and Mellini (2004).

C 139 Cassiar Asbestos mine, British Columbia, Canada.Interpenetrating antigorite from the hanging wall. Fe3+/Fe = 0.22 (O’Hanley and Dyar 1993) and O’Hanley and Wicks (1995).

7 Elba Slip-fiber antigorite, eastern Elba Island, Italym = 14 Viti and Mellini (1996)

18 Elba Slip-fiber antigorite, eastern Elba Island, Italym = 18 Viti and Mellini (1996)

IM-1A, 3B Iron Mountain, N. Cascades, Washington.Donated by N.I. Christensen. Massive antigorite serpentinite, Shuksan blueschist terrane. For this and GP see Brown et al. (1982).

GP Gee Point, N. Cascades, Washington. Massive antigorite serpentinite. Donated by N.I. Christensen

1912-392 Reichenstein, Prussian Silesia.Natural History Museum, London. Coarse skarn of large flakes of pale green foliated antigorite with magnetite crystals and dolomite. See Caillère (1936).

OF 2835 Lanzo ultramafic massif, Internal Western Alps, Italy.Cross-fiber antigorite vein. Donated by C. Groppo and R. Compagnoni. See Groppo and Compagnoni (2007).

1917-232 No. 2 shaft, Terra Nova, New Foundland.Natural History Museum, London. Polished “precious” fragment of serpentine. Lizardite by XRD.

1922-651 Findelen Glacier, Zermatt, Switzerland.Natural History Museum, London. Labeled antigorite, variety “schweizerite”. 10-cm long pale green curved splintery mass. Mostly chrysotile? Whittaker and Zussman (1956) found schweizerite Spec. 8, (OUM 3930) from Zermatt to be clinochrysotile.

31725 Switzerland. Pale, grass-green, 5-cm long fibers, very similar to 1922-651 and maybe also from Findelen Glacier. “Picrosmine” according to E. Weinschenk. With magnetite.

1966.500 Snarum, Buskerud, Norway.Natural History Museum, London. Labeled “antigorite-B” Yellowish green massive lizardite, with 1 cm hematite. From a lens of ultramafic rock enclosed in gneiss. See Whittaker and Zussman (1956) sample OUM 17788, mainly lizardite; also Faust and Fahey (1962) sample F-71.

Greenalite San Valentin Pb-Zn-Fe open pit mine, La Union, Cartagena mining district, Murcia, Spain. Massive greenalite. Subvolcanic late Tertiary magnetite replacement of limestone. See Kager (1980) and Guggenheim et al. (1982).