General Piemontite Information![]() Ca2(Al,Mn,Fe)3(SiO4)3(OH) = Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) |
![]() Molecular Weight = 488.18 gm |
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Calcium 16.42 % Ca 22.97 % CaO |
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Manganese 10.13 % Mn 13.08 % MnO |
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Aluminum 9.95 % Al 18.80 % Al2O3 |
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Iron 3.43 % Fe 4.42 % FeO |
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Silicon 17.26 % Si 36.92 % SiO2 |
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Hydrogen 0.21 % H 1.85 % H2O |
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Oxygen 42.61 % O |
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100.00 % 98.03 % = TOTAL OXIDE |
![]() Ca2Al1.8Mn2+0.9Fe2+0.3(SiO4)3(OH) |
![]() Contact metamorphic rocks. |
![]() Valid Species (Pre-IMA) 1853 - Dana number changed from 58.2.1a.11 |
![]() Piedmont, Italy. Link to MinDat.org Location Data. |
![]() Named after its locality. |
![]() Piemontite + Pronunciation |
![]() ![]() Piedmontite |
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Piemontite Crystallography![]() a:b:c =1.5609:1:1.7917 |
![]() a = 8.843, b = 5.665, c = 10.15, Z = 2; beta = 115.4° V = 459.32 Den(Calc)= 3.53 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m |
![]() By Intensity(I/Io): 2.903(1), 2.598(0.5), 4(0.5), |
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| Physical Properties of Piemontite![]() {001} Good, {100} Distinct |
![]() Yellow, Carmine red, Red, Reddish brown, Reddish black. |
![]() 3.4 |
![]() Translucent |
![]() Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende). |
![]() Blocky - Crystal shape tends to be equant (e.g. feldspars). |
![]() Massive - Granular - Common texture observed in granite and other igneous rock. |
![]() Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
![]() 6-7 - Orthoclase-Quartz |
![]() Non-fluorescent. |
![]() Vitreous (Glassy) |
![]() Nonmagnetic |
![]() red |
| Optical Properties of Piemontite![]() CI meas= -0.099 (Poor) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.059 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2163,KPDmeas= 0.2246,KC= 0.2043 Ncalc = 1.69 - 1.72 ![]() Biaxial (+), a=1.725-1.756, b=1.73-1.789, g=1.75-1.832, bire=0.0250-0.0760, 2V(Calc)=54-86, 2V(Meas)=50-86. Dispersion strong, r > v. |
![]() pale yellow, yellow, lemon yellow, orange, or red. |
![]() pale purple, amethyst violet, violet, rose, or deep red. |
| Calculated Properties of Piemontite![]() Bulk Density (Electron Density)=3.48 gm/cc |
note: Specific Gravity of Piemontite =3.53 gm/cc. ![]() Fermion Index = 0.0092141919 |
Boson Index = 0.9907858081 ![]() PEPiemontite = 6.55 barns/electron |
U=PEPiemontite x rElectron Density= 22.82 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Piemontite is Not Radioactive | Piemontite Classification![]() 58.02.01a.05 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups |
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(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2) |
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(58.02.01a)Epidote group (Clinozoisite subgroup) |
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![]() 09.BG.05a 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups; |
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| Other Piemontite Information![]() Links to other databases for Piemontite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Minerals in Thin Section-University of North Carolina 14 - Online Mineral Museum 15 - QUT Mineral Atlas 16 - Ruff.Info 17 - WWW-MINCRYST Search for Piemontite using: Visit our Advertisers for Piemontite : A Bijoux Google Search for PiemontiteAdam's Minerals Google Search for Piemontite Cape Minerals Google Search for Piemontite Dakota Matrix Minerals Google Search for Piemontite Excalibur Mineral Corp. Google Search for Piemontite Exceptional Minerals Google Search for Piemontite John Betts Fine Minerals Search for Piemontite McDougall Minerals Google Search for Piemontite Mineral News Website Link Rock and Mineral Shows Google Search for Piemontite Weinrich Minerals, Inc. Google Search for Piemontite Ask about Piemontite here : Print or Cut-and-Paste your Piemontite Specimen Label here :
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