Guide to the Mineral Collections in the Illinois State Museum
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Basel section of aragonite; interpenetrant triplet.
shows botryoidal masses from Quincy; No. 3176 from the Black Hills; Nos. 3467 and 3468 are from Fort Collins. Carlsbad, Bohemia, is also represented. No. 3902 is an unusually fine group consisting of two large crystals of interpenetrating triplets and several smaller imperfect crystals. The largest crystal measures about four inches in diameter and is two inches high.
SUMMARY Aragonite. CaCO 3 ; CaO = $6 per cent, CO 2 = 44 per cent. Ortho- rh...ombic. A:6:c = o. 628:io. 72i. (no), (oio), (on), (ooi), (in); twinned on (no); cleavage (oio), (no) imperfect; brittle; fracture sub-conchoidal.
Hardness = 3. 5; gravity =2. 9. Colorless ; vitreous ; transparent ; mean angle of refraction, (3= 1. 682, the least, a= 1. 530. Double refrac- tion very strong, negative, i. E. , difference between the greatest angle of refraction, y, and the least, a, is o. 156.
Infusible; effervesces in hydrochloric acid.
Spain, Sicily, Cordilleran states.
CARBONATES 125 Witherite This carbonate of barium occurs in white, heavy, not very abundant crystals and masses.
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To quickly assess the difficulty of the text, read a short excerpt:
Basel section of aragonite; interpenetrant triplet.
shows botryoidal masses from Quincy; No. 3176 from the Black Hills; Nos. 3467 and 3468 are from Fort Collins. Carlsbad, Bohemia, is also represented. No. 3902 is an unusually fine group consisting of two large crystals of interpenetrating triplets and several smaller imperfect crystals. The largest crystal measures about four inches in diameter and is two inches high.
SUMMARY Aragonite. CaCO 3 ; CaO = $6 per cent, CO 2 = 44 per cent. Ortho- rh...ombic. A:6:c = o. 628:io. 72i. (no), (oio), (on), (ooi), (in); twinned on (no); cleavage (oio), (no) imperfect; brittle; fracture sub-conchoidal.
Hardness = 3. 5; gravity =2. 9. Colorless ; vitreous ; transparent ; mean angle of refraction, (3= 1. 682, the least, a= 1. 530. Double refrac- tion very strong, negative, i. E. , difference between the greatest angle of refraction, y, and the least, a, is o. 156.
Infusible; effervesces in hydrochloric acid.
Spain, Sicily, Cordilleran states.
CARBONATES 125 Witherite This carbonate of barium occurs in white, heavy, not very abundant crystals and masses.
What to read after Guide to the Mineral Collections in the Illinois State Museum?
You can find similar books in the "Read Also" column, or choose other free books by Illinois State Museum to read onlineMoreLess
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