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Humite

Pictures (33 Images total)

Humit
Views (Image: 1257176943): 2332, Rating: 9.6
Humit

Größe: 4,54 mm; Fundort: Steinbruch San Vito, San Vito, Ercolano, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien

Copyright: Matteo Chinellato
Contribution: Hg 2009-11-02
Locality: Steinbruch San Vito (Cava San Vito) / San Vito / Ercolano / Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Humit
Views (Image: 1272356864): 2190
Humit

Größe: 1,9 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2010-04-27
Locality: Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Humit
Views (Image: 1256630506): 2358
Humit

Größe: 2,47 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2009-10-27
Locality: Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Humit
Views (Image: 1303725075): 414
Humit

Größe: 1,06 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2011-04-25
Locality: Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Humit
Views (Image: 1395389404): 1647
Humit

Größe: 1,45 mm; Fundort: Steinbruch San Vito, San Vito, Ercolano, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien, Italien

Copyright: Matteo Chinellato
Contribution: Hg 2014-03-21
Locality: Steinbruch San Vito (Cava San Vito) / San Vito / Ercolano / Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Humit
Views (Image: 1303725033): 1543, Rating: 9.4
Humit

Größe: 0,78 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2011-04-25
Locality: Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien

Collectors Summary

Color braun, gelb, weiß, dunkel orange
Streak color weiß
Hardness (Mohs) 6
Solubility +++ HF, konz. warme H2SO4, + andere Säuren
Crystal System orthorhombisch, Pbnm

Chemism

Chem­ical formula

Mg7(SiO4)3(F,OH)2

Chem­ical com­po­si­tion

Magnesium, Silicium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 483.386463375 u; Number of atoms in the formula: 24.5

Info

Empirical formula:

Mg7(SiO4)3(F0.75(OH)0.25)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.10

0.5

2.04

1.0079470

0.5039735

Oxygen

O

41.37

12.5

51.02

15.9994300

199.9928750

Fluorine

F

5.90

1.5

6.12

18.9984033

28.4976049

Magnesium

Mg

35.20

7

28.57

24.3050600

170.1354200

Silicon

Si

17.43

3

12.24

28.0855300

84.2565900

Anal­y­sis wt%

SiO2 : 36.43, FeO : 5.03, MnO : 0.65, MgO : 53.84, H2O : 1.69, F : 4.07 (Ref: American Mineralogist 71)

Strunz 9th edi­tion incl. updates

9.AF.50

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
50:Humit-Gruppe

Lapis Clas­sifica­tion

VIII/B.04-030

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
4: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]; Humit-Gruppe

Clas­sifica­tion by Hölzel

9.AI.240

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
2: Norbergite-Group

Dana 8th edi­tion

52.03.02c.01

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
03: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
02c: Humite group (Humite series)

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Humite polysomatic series

Optical Properties

Color

braun, gelb, weiß, dunkel orange

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

max. Birefrin­gence

0.029

Birefringence chart\! Humite title=Birefringence chart Humite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.624

RI value β

1.633

RI value γ / ε

1.653

Ri mean

1.637

2V angle

Biaxial (+) 66°!

Optical Data Luminescence

Color SW-UV (254nm)

 

gelb

SW-UV Intensity

stark

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell param­e­ters a (Å)

20.86

Cell param­e­ters b (Å)

4.74

Cell param­e­ters c (Å)

10.23

Cell param­e­ters a/b or c/a

4.401

Cell param­e­ters c/b

2.158

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1011.506

X-Ray Pow­der Diffrac­tion

3.64(50),
2.691(50),
2.572(40),
2.438(70),
2.256(100),
2.107(40),
1.739(60),
1.479(70)

XRD chart Humite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

6

VHN (Hard­ness Vick­ers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.1 - 3.2 / Durchschnittlich = 3.15

3.174 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ HF, konz. warme H2SO4, + andere Säuren

Preface

Author (Name, Year)

Bournon, 1813

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 351

IMA group assignments

Other languages

German

Humit

Spanish

Humita

French

Humite

English

Humite

Russian

Гумит

Simplified Chinese

硅镁石

Alternative Name

Umit

Umita

Umite

CNMNC symbol

Symbol

Hu

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Humit
Google-Bilder-Suche - search for: Humit
Mineralienatlas.de (Forum) - search for: Humit

English pages

Mindat - search for: Humite
Webmineral - search for:Humite
Handbook-of-Mineralogy - search for: Humite
RRUFF - Raman, XRD and other mineral data - search for: Humite
RRUFF - References and PDF downloads - search for: Humite
American-Mineralogist-Crystal-Structure-Database - search for: Humite
Strahlen.org - search for: Humite

Russian pages

Webmineral.ru - search for: Гумит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Humit
Crystal-Treasure.com - search for: Humit
Bosse - search for: Humit
Edelsteine Neuburg - Gundolf Fischer - search for: Humit

Locations with GPS information