Mineralogical Notes Sekies 1

DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, DIRECTOR BULLETIN 490 MINERALOGICAL NOTES SEKIES 1 BY WALDEMAR T. SCHALLER WASHINGTON GOVERNMENT PRINTING OFFICE 1911 CONTENTS. Page. Introduction............................................................. 7 Chemical composition of hulsite and paigeite...........................__ 8 Introduction.....................................................__ 8 Occurrence and association........................................_. 8 Notes on chemical examination...................__............_. 10 General statement...........................__................. 10 The gangue...................................................... 11 Methods of analyses.............................................. 13 Hulsite.............................................................. 16 Crystallography............... ... ....... ................ 16 General properties........ ................. ............... 16 Character of samples ............................................. 17 Analyses and ratios.......................__.................... 18 Discussion of formulas............................................ 20 Paigeite ................................ .......................... 21 General description .............................................. 21 Character of samples............................................. 22 Analyses and ratios .............................................. 22 Discussion of formulas...... ................................. 24 Chemical composition of jamesonite and warrenite .........^............._ k 25 Introduction................................. ..................... 25 Formula of jamesonite................................................. 25 Composition of warrenite............................................. 27 Ludwigite from Montana................................................... 28 Occurrence and association............................................ 28 Analysis.......................................................... 28 Discussion of formula................................................. 30 Ludwigite from Hungary.............................................. 31 Summary............................................................ 32 Bismite from Nevada ..................................................... 33. Occurrence and physical properties.................................... 33 Crystallography...................................................... 34 Chemical composition.............................................. 86 Axinite from California..... .. .......................... 37 Localities............................................................ 37 Axinitefrom San Diego County..... .............. .. .....__ 37 Occurrence...................................... ........ 37 Crystallography............................................... 37 Chemical com position.............................................. 38 Axinite from Amador County ......................................... 42 Crystallography.................................................. 42 Chemical composition............................................. 46 3 4 . CONTENTS. Page. Albite from lawsonite schist, Marin County, Cal. ........ 48 Association ................. .. ........ ..... .... 48 Forms and angles..................................................... 48 Description of rarer forms............................................. 50 Combinations........................................................ 52 Habit ............................................................... 52 Notes on crystallography of phenacite ..................................... 53 Phenacite from New Hampshire..... .... ........ ...........' 53 Form system of phenacite....... .. ..... ... 53 Notes on neptunite....................................................... 55 Neptunite from California........................ .. .......... 55 Form system of neptunite............................................. 56 Orbicular gabbro from Pala, San Diego County, Cal......................... 58 The refractive index of oil of cinnamon.......... ... .. ........... 60 Introduction ............................... 4....................... 60 General description.................................. ............ 60 Measurements of refractive index...................................... 61 Summary............................................................ 64 Index of refraction of Canada balsam......... ... .............. 65 Siderite and barite from Mary land...... ..... .... ......... 66 Siderite.............................................._..._....... 66 Occurrence...................... ......... .......... 66 Chemical composition............................................. 66 Crystallography............................................. .. 67 Forms....................... ............................. 67 Etchfigures.................................................. 69 Value for c axis .............................................. 69 Barite............................................................... 70 Occurrence ...................................................... 70 Crystallography .........................."........... ............. 71 Notes on purpurite and heterosite ......................................... 72 Introduction........................'................................. 72 Purpurite from North Carolina........................................ 72 Occurrence.........................................._......... 72 Physical properties............................................... 73 Chemical composition ............................................ 74 Heterosite from South Dakota......................................... 77 Heterosite from Connecticut ........................................... 78 Purpurite from California............................ ............ 79 Conclusion................................................ 79 Notes on powellite.........y............................. __......... 80 Powellite from Llano County, Tex................ ............... 80 Powellite from Nye County, Nev............................. .__. 81 Density of powellite .................................................. 82 Chemical composition of molybdic ocher........................_........ 84 Introduction ............................................ .......... 84 Physical properties................................................... 85 Optical characters ................................................ 85 Pyrognostic characters............................................ 85 Density............................................._......_. 86 Solubility in water ............................................... 86 Chemical analyses................................... ..*... .... 86 Molybdite from New Hampshire .................................. 86 Molybdite from other localities.................. .... r ............. 88 CONTENTS ILLUSTRATIONS. , 0 Page. Chemical composition of molybdic ocher Continued. Artificial molybdite....................................... 91 Occurrence of natural trioxide of molybdenum ......................... 92 Analysis of tourmaline from Elba.......................................... 93 Evansite from two American localities.. .................... _. 94 Evansite from Idaho.......................................__. .. 94 Evansite from Alabama.................................. ......... 95 Literature..................................... ........ 95 Manganotantalite from Mount Apatite, Me........__.....____._.. 96 Zinnwaldite from Alaska...-...................._...... ...... ._......... 98 Some new forms of calcite crystals......................................... 99 Calcite from Andreasberg, Germany.................................... 99 Calcite from England ............................. ............ 100 Calcite from San Francisco, Cal........................................ 103 Calcite from Hillsboro, N. Mex......_..._............... ....... 104 Calcite from Lincoln, R. I................................. ........ 107 ILLUSTRATIONS. Page. FIGURE 1. Bismite crystal................_........'........................ 36 2. Bismite crystal................................................. 36 3. Variation in index of refraction for oil of cinnamon............... 63 - 4. Siderite from Maryland......................................... 68 5. Etch figures of siderite.......................................... 69 6. Barite from Maryland ......................_____....___ 71 7. Heterositefrom South Dakota................................... 77 8. Calcite from Germany....................................._.. 100 9. Calcite from England........................................... 102 10. Calcite from England........................................... 102 11. Calcite from California ......................................... 103 12. Calcite from New Mexico....................................... 104 13. Calcite from New Mexico....................................... 106 14. Calcite from Rhode Island...................................... 108 MINERALOGICAL NOTES-SERIES 1. By WALDEMAK T. SCHALLER. INTRODUCTION. The miscellaneous papers here assembled are submitted as a report on the mineralogical work of research character conducted by the author in the chemical laboratory of the United States Geological Survey from 1905 to 1909. A similar report on earlier work (1903- 1905) was published as Mineralogical Notes in Bulletin 262 (1905), on pages 121-144. Besides these papers, a report on an investigation of the mercury

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