51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-10-13 08:23:54
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 11:51:27
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 08:58:30
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 11:21:06
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-09-06 13:40:01
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56 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 09:46:12
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57 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:14:36
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-13 13:11:48
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59 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-06-29 08:23:10
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60 | Add to Reading ListSource URL: www.handbookofmineralogy.orgLanguage: English - Date: 2007-09-30 02:34:02
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