[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions] Dan Weinrich Fine Minerals Full-time professional mineral dealer with over 31 years experience in mineral collecting And 15 years selling mineral specimens on the internet and at major mineral shows General Howlite InformationCa2B5SiO9(OH)5 |
Molecular Weight = 391.32 gm |
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Calcium 20.48 % Ca 28.66 % CaO |
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Silicon 7.18 % Si 15.35 % SiO2 |
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Boron 13.81 % B 44.48 % B2O3 |
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Hydrogen 1.29 % H 11.51 % H2O |
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Oxygen 57.24 % O |
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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. |
Howlite |
ICSD 15178 |
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PDF 26-1404 |
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Howlite Crystallographya: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 HowliteNone |
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 |
Fluorescent, Long UV=bright sky blue. |
Earthy (Dull) |
Nonmagnetic |
white |
| Optical Properties of HowliteCI 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 Ncalc = 1.59 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 HowliteBulk Density (Electron Density)=2.62 gm/cc |
note: Specific Gravity of Howlite =2.62 gm/cc. Fermion Index = 0.03 |
Boson Index = 0.97 PEHowlite = 2.97 barns/electron |
U=PEHowlite x rElectron Density= 7.79 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Howlite is Not Radioactive | Howlite Classification25.03.05.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen |
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(25.03)Dana Type |
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(25.03.05)Dana Group |
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06.CB.20 06 - BORATES |
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06.C - Triborates |
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06.CB -Ino-triborates |
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| Other Howlite InformationNAME( MinRec) PHYS. PROP.(Collectors Book of Fluorescent Minerals) 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 - Ecole des Mines de Paris 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - MinMax(Deutsch) 12 - MinMax(English) 13 - Mineral and Gemstone Kingdom 14 - Mineralienatlas (Deutsch) 15 - QUT Mineral Atlas 16 - Ruff.Info 17 - Tradeshop.com - The Rainbow of Gems 18 - WWW-MINCRYST Search for Howlite using: Visit our Advertisers for Howlite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Howlite Mineral Data : Ask about Howlite here : Print or Cut-and-Paste your Howlite Specimen Label here :
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