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Howlite Mineral Data + |
General Howlite Information |
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| Ca2B5SiO9(OH)5 | |||
| Molecular Weight = 391.32 gm | |||
| Calcium 20.48 % Ca 28.66 % CaO | |||
| Silicon 7.18 % Si 15.35 % SiO2 | |||
| Boron 13.81 % B 44.48 % B2O3 | |||
| Hydrogen 1.29 % H 11.51 % H2O | |||
| Oxygen 57.24 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Ca2B5SiO9(OH)5 | |||
| Secondary mineral in arid environments. | |||
| Valid Species (Pre-IMA) 1868 | |||
| Tick Canyon, Los Angeles Co., California. Link to MinDat.org Location Data. | |||
| Named after Henry How of Nova Scotia when he first described it in 1868. | |||
| ICSD 15178 | |||
| PDF 26-1404 | |||
Howlite Image | |||
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Howlite Crystallography |
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| a:b:c =1.3697:1:0.9217 | |||
| a = 12.78, b = 9.33, c = 8.6, Z = 4; beta = 104.83° V = 991.28 Den(Calc)= 2.62 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | |||
| By Intensity(I/Io): 6.207(1), 3.894(0.95), 3.094(0.65), | |||
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Mouse |
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Physical Properties of Howlite |
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| None | |||
| Colorless, White. | |||
| 2.58 | |||
| Translucent | |||
| Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| Massive - Uniformly indistinguishable crystals forming large masses. | |||
| Nodular - Tuberose forms having irregular protuberances over the surface. | |||
| 2.5-3.5 - Finger Nail-Copper Penny | |||
| Non-fluorescent. | |||
| Earthy (Dull) | |||
| Nonmagnetic | |||
| white | |||
Optical Properties of Howlite |
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| CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2252,KPDmeas= 0.2287,KC= 0.2269 |
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| Biaxial (-), a=1.58, b=1.59, g=1.6, bire=0.0200, 2V(Calc)=88, 2V(Meas)=60-90. Dispersion none. | |||
| none. | |||
| none. | |||
| none. | |||
Calculated Properties of Howlite |
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relectron=2.62 gm/cc |
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| Fermion Index = 0.03139 Boson Index = 0.96861 |
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PEHowlite = 2.97 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Howlite is Not Radioactive |
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Howlite Classification |
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| 25.3.5.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen | |||
| (25.3)Dana Type | |||
| (25.3.5)Dana Group | |||
| VIII/F.28-10 VIII - Silicates | |||
| VIII/F - Inosilicates (chain and band) Six chains [Si6O18]12- and six bands [Si12O30]12- | |||
| VIII/F.28 - Howlite series | |||
Other Howlite Information |
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| NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | |||
| Links to other databases for Howlite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 - Mineral and Gemstone Kingdom 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - Tradeshop.com - The Rainbow of Gems 16 - WWW-MINCRYST 17 -École des Mines de Paris Search for Howlite using: Visit our Advertisers for Howlite : Translate Howlite Mineral Data : Ask about Howlite here : Print or Cut-and-Paste your Howlite Specimen Label here :
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