[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies] We specialize in fine European and Asian Mineral Specimens Heliodor is based in Prague, Czech Republic General Lawsonite InformationCaAl2Si2O7(OH)2•(H2O) |
Molecular Weight = 314.24 gm |
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Calcium 12.75 % Ca 17.85 % CaO |
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Aluminum 17.17 % Al 32.45 % Al2O3 |
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Silicon 17.88 % Si 38.24 % SiO2 |
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Hydrogen 1.28 % H 11.47 % H2O |
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Oxygen 50.91 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
CaAl2Si2O7(OH)2•(H2O) |
Originally described from a crystalline schist associated with serpentine. Also found as a secondary mineral in altered gabbros and diorites. |
Valid Species (Pre-IMA) 1895 |
Reed Station, Tiburon peninsula, Marin County, California, USA. Link to MinDat.org Location Data. |
Named for Andrew Cowper Lawson (1861-1952), Scottish-American geologist. |
Lawsonite + Pronunciation |
ICSD 80835 |
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PDF 13-533 |
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Lawsonite Crystallographya:b:c =1.5051:1:2.2488 |
a = 8.79, b = 5.84, c = 13.133, Z = 4; V = 674.16 Den(Calc)= 3.10 |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Ccmm |
By Intensity(I/Io): 2.624(1), 1.55(0.8), 2.726(0.7), |
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| Physical Properties of Lawsonite{010} Perfect, {001} Perfect, {110} Poor |
Colorless, White, Gray, Blue, Pinkish. |
3.09 |
Translucent to transparent |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Tabular - Form dimensions are thin in one direction. |
7.5 - Garnet |
Non-fluorescent. |
Vitreous - Greasy |
Nonmagnetic |
white |
| Optical Properties of LawsoniteCI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2176,KPDmeas= 0.2183,KC= 0.2232 Ncalc = 1.69 Biaxial (+), a=1.665, b=1.672-1.676, g=1.684-1.686, bire=0.0190-0.0210, 2V(Calc)=76-86, 2V(Meas)=84-85. Dispersion strong, r > v. |
colorless or blue. |
colorless or yellow. |
| Calculated Properties of LawsoniteBulk Density (Electron Density)=3.11 gm/cc |
note: Specific Gravity of Lawsonite =3.09 gm/cc. Fermion Index = 0.0087662672 |
Boson Index = 0.9912337328 PELawsonite = 2.77 barns/electron |
U=PELawsonite x rElectron Density= 8.60 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Lawsonite is Not Radioactive | Lawsonite Classification56.02.03.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O |
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(56.02)with cations in [4] and/or >[4] coordination |
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(56.02.03)Lawsonite - Ilvaite group |
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09.BE.05 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BE -Si2O7 groups with additional anions; |
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| Other Lawsonite Information Links to other databases for Lawsonite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 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 - Mineralienatlas (Deutsch) 13 - Minerals in Thin Sections-Humboldt State 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - WWW-MINCRYST Search for Lawsonite using: Visit our Advertisers for Lawsonite : 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 Lawsonite Mineral Data : Ask about Lawsonite here : Print or Cut-and-Paste your Lawsonite Specimen Label here :
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