 | | Report (issue) | | DESCRIPTIVE MINERALOGY OF PENNSYLVANIA 104 Na 2Al 2 Si3 Oi .2H 2 O; SiO 2 47.4, A1 2 O 3 26.8, Na...Na 2 O 16.3, Lenni, Delaware County. Crystals. Eyerman, 1911, 11. Composition: Analysis: Fe 2 O3 CaO...Sp.gr LOCALITIES: Berks County: Birdsboro, and Gickerville; Delaware County: Leiperville, Lenni (druses... Felton's farm (Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville ; Philadelphia:...Philadelphia: Fairmount Park, Frankford, and Rit- enhouse quarry. SCOLECITE CaAl 2 Si3 Oi .3H 2 O MONOCLINIC |  | | Report (issue) | | Serpentine-Group Minerals GEOLOGICAL SURVEY PROFESSIONAL PAPER 384-A The Serpentine-Group Minerals By...term "serpentine"- ___--___-____-______--_-_____ Mineral names used in this study.______________ _____ Geological...method-___. Previous DTA studies on serpentine-group minerals._ _______________________________ Present..._--_-__ X-ray classification of the serpentine-group minerals. X- ray powder diffraction studies. . ________________...___________ Clinochrysotile (Globe-type), Gila County, Ariz___________________________________________ |  | | Book (edition) | | comprehensive information and is designed to lead amateur mineral collectors to America's precious and semipre-...describes sites under of the nearest town and county. and the many maps included book contain such...are in Yet the fascination and lure of these mineral treasures continues as strong as ever. Who with...times, jewels were privileges of the rich. The mineral sources were tightly guarded secrets, as were...or by buying many dealers who advertise in the mineral play their treasures at from the magazines or |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...their interest. earth sciences are as wide as the mineral kingdom itself, with something for everyone. How...amber of ancient trees. More than 2,000 distinct mineral species are known; only about 100 of these have...some exceptions, to qualify as gem material a mineral must be beautiful and rare enough to be desirable...weight, of the mineral. 4. 5. 6. 7. 8. 9. — — — — the innate shape of the mineral. Cleavage — |
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