Articles

The History of the Beale/Woolley Depth of Cut Indicator (Version #2, March 4, 2002)

or High Resolution Analog Mast Flex Indicator – An Inexpensive Soft Stop for Faceting Machines (Version #2, March 4, 2002) Marcus Beale and Dave Woolley [DaveWool@WEBTV.net] Marcus Beale and I took classes together at Central Virginia Community College in Lynchburg, Virginia not knowing we shared interests outside the classroom. It was after Marcus and his […]

United States Faceting Guilds, Clubs and Schools

Big Sky Faceters Guild, Inc. Affiliation: Newsletter: Mailing Address: PO Box 564, Great Falls, MT 59403-0564 Meetings: 4th Tues. 7:00pm, Montana School for Deaf & Blind E-mail: Phone: (406) 727-2315 Columbia-Willamette Faceter’s Guild Affiliations: Northwest Federation of Mineralogical Societies Newsletter: FACETS Mailing Address: P.O. Box 684 Fairview, OR 97024  Meetings: 1st Tuesday of the month […]

Properties of Commonly Faceted Minerals and Materials

Material Refractive Index Critical Angle Birefringenge Dispersion Hardness Specific Gravity Crystal System Class Formula Cleavage Apatite series 1.64 37.57° .004 .013 5.0 3.05-3.20 hexagonal 6/m Ca5(PO4,CO3)3(F,Cl,OH) 2; {0001}indistinct; {10-10} trace Beryl 1.57-1.60 38.68-39.56° .006-.009 .014 7.5-8.0 2.60-2.90 hexagonal 6/m 2/m 2/m Be3Al2Si6O18 1; {0001} indistinct Color varieties of beryl include aquamarine (blue), emerald (green), goshenite […]