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Andradite

Pictures (472 Images total)

Andradit
Views (Image: 1480334770): 5143, Rating: 9.55
Andradit

FOV = ca. 45 mm

Collection: Andreas Schmid
Copyright: Andreas Schmid
Contribution: Andreas Schmid 2016-11-28
Locality: Serifos, Insel / Kykladen / Südliche Ägäis (Νότιο Αιγαίο) / Griechenland
Andradit
Views (Image: 1464186769): 9272, Rating: 10
Andradit

Andradite on Hedenbergite "Garnet Garden"; FOV = 80 mm; Serifos; Greece

Collection: Andreas Schmid
Copyright: Andreas Schmid
Contribution: Andreas Schmid 2016-05-25
Locality: Serifos, Insel / Kykladen / Südliche Ägäis (Νότιο Αιγαίο) / Griechenland
Andradit
Views (Image: 1464185698): 5848, Rating: 9.8
Andradit

FOV = ca. 20 mm; Serifos Island, Cyclade Islands, Kykládes Prefecture, Aegean Islands Department; Greece

Collection: Andreas Schmid
Copyright: Andreas Schmid
Contribution: Andreas Schmid 2016-05-25
Locality: Serifos, Insel / Kykladen / Südliche Ägäis (Νότιο Αιγαίο) / Griechenland
Andradit
Views (Image: 1291815093): 9678, Rating: 9.5
Andradit

Bildbreite: 2,26 mm, Fundort: Nickenicher Sattel, Nickenich, Eifel, Rheinland-Pfalz, Deutschland

Copyright: Matteo Chinellato
Contribution: Hg 2010-12-08
Locality: Nickenicher Sattel (Eicher Sattel) / Nickenich / Pellenz, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Andradit
Views (Image: 1464612899): 4337, Rating: 10
Andradit

FOV = 45 mm; Serifos; Greece

Collection: Andreas Schmid
Copyright: Andreas Schmid
Contribution: Andreas Schmid 2016-05-30
Locality: Serifos, Insel / Kykladen / Südliche Ägäis (Νότιο Αιγαίο) / Griechenland
Andradit
Views (Image: 1523809602): 1743, Rating: 9.5
Andradit

Stufengröße = ca. 70 mm; Das Bemerkenswerte an der Stufe ist, dass sie 2 verschiedene Kristallformen von Andradit vereint. Und was sie wirklich besonders macht ist der stufenlose Übergang dieser zw...

Copyright: Andreas Schmid
Contribution: Andreas Schmid 2018-04-15
Locality: Serifos, Insel / Kykladen / Südliche Ägäis (Νότιο Αιγαίο) / Griechenland

Collectors Summary

Color rot, braun, gelb, grün, schwarz
Streak color weiß
Lustre Glasglanz, Melanit z.T. Halbmetallglanz
Hardness (Mohs) 6.5 - 7
Solubility +++ HF, warme HCl, Königswasser
Crystal System kubisch, Ia3d
Morphology Oft idiomorph ausgebildete Kristalle; Rhombendodekaeder, Deltoidalikositetraeder (Ikositetraeder) und Kombinationen von beiden

Additional information / Summary

Siehe auch Mineralienportrait: Granat - Andradit

Chemism

Chem­ical formula

{Ca3}[Fe3+2](Si3)O12

Chem­ical com­po­si­tion

Calcium, Eisen, Silicium, Sauerstoff

Unit weight: 508.17535 u; Number of atoms in the formula: 20

Info

Empirical formula:

{Ca3}[Fe2](Si3)O12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

37.78

12

60.00

15.9994300

191.9931600

Silicon

Si

16.58

3

15.00

28.0855300

84.2565900

Calcium

Ca

23.66

3

15.00

40.0784000

120.2352000

Iron

Fe

21.98

2

10.00

55.8452000

111.6904000

Anal­y­sis wt%

SiO2 : 35.60, Fe2O3 : 30.70, Al2O3 : 1.26, CaO : 33.20, MnO : 0.87

Strunz 9th edi­tion incl. updates

9.AD.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
25:Granat-Gruppe

Lapis Clas­sifica­tion

VIII/A.08-110

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
8: Kationen in kubischer und oktaedrischer Koordination [8+6]; Granat-Gruppe

Clas­sifica­tion by Hölzel

9.AC.300

9: SILICATES
A: Nesosilicates
C: Garnet-Group
3: Andradite-Group - 6-coord. Fe(3+)

Dana 8th edi­tion

51.04.03b.01

51: Nesosilicate Minerals
04: Nesosilicates Nesosilicate Insular SiO4 Groups Only with cations in [6] and >[6] coordination
03b: Garnet group (Ugrandite series)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Garnet supergroup  ⇒ Silicate garnets; Garnet group (Z charge 12)

Optical Properties

Color

rot, braun, gelb, grün, schwarz

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent-opak

Lus­tre

Glasglanz, Melanit z.T. Halbmetallglanz

RI value α / ω / n

1.887

Ri mean

1.887

2V angle

Isotropisch

Crystallography

Crystal Sys­tem

kubisch

Class (H-M)

m3m

Space Group number

230

Space Group

Ia3d

Cell param­e­ters a (Å)

12.052

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

-

Cell param­e­ters a/b or c/a

1

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

8

Volumne (ų)

1750.561

X-Ray Pow­der Diffrac­tion

3.015(60),
2.696(100),
2.462(40),
1.956(20),
1.673(20),
1.611(60),
1.316(20),
1.119(20)

XRD chart Andradite

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

Morphol­ogy

Oft idiomorph ausgebildete Kristalle; Rhombendodekaeder, Deltoidalikositetraeder (Ikositetraeder) und Kombinationen von beiden

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

6.5 - 7

VHN (Hard­ness Vick­ers)

1110 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.9 (gemessen)

3.856 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ HF, warme HCl, Königswasser

(Co-)Type locality

(Co-)Type locality

Norwegen/Viken, Provinz/Drammen

Preface

Rare­ness

häufig

Name from

dem brasilianischen Mineralogen J.B. d'Andrada e Silva (1763-1838).

Grew, E.S., Locock, A.J., Mills, S.J., Galuskina, I.O., Galuskin, E.V., Halenius, U., 2012; Nomenclature of the garnet supergroup. American Mineralogist; preprint December 2012 - [For

Author (Name, Year)

Dana, 1868

References

American Mineralogist 76 (1991), 1249

IMA group assignments

 
{X3}[Y2](Z3)φ12
 
 


 
 
 
{Fe2+3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[Fe3+2](Si3)O12
kubisch
Ia3d

 
 
 
{Mn2+3}[Fe3+2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[Sc2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[V3+2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[Ti2](SiAl2)O12
kubisch
Ia3d

 
 
 
{Mg3}[Cr3+2](Si3)O12
kubisch
Ia3d

 
 
 
{Mg3}[MgSi](Si3)O12
kubisch
 

 
 
 
{Y2Ca}[Mg2](Si3)O12
kubisch
Ia3d

 
 
 
{Mn2+3}[V3+2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[TiFe2+](Si3)O12
kubisch
Ia3d

 
 
 
{Mg3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
{Mn2+3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
{Ca3}[Cr3+2](Si3)O12
kubisch
Ia3d

Refresh list

Actuality: 23. Jun 2022 - 12:42:56

Varieties

Demantoid

grüner Andradit

Hydroandradite

Melanite

Topazolite

Other languages

Dutch

Andradiet

German

Andradit

Spanish

Andradita

Lithuanian

Andraditas

French

Andradite

English

Andradite

Polish

Andradyt

Russian

Андрадит

Ukrainian

Андрадит

Japanese

灰鉄柘榴石

Simplified Chinese

钙铁榴石

Alternative Name

German

Allochroit

Spanish

Allochroita

Allochroite

Andradite Garnet

Spanish

Andradito

Aplom

Aplome

German

Calcium-Ferrigranat

Jellelite

Jellesite

Jelletite

German

Kalkeisengranat

Kalkeisentongranat

Polyadelphine

German

Polyadelphit

Spanish

Polyadelphita

Polyadelphite

Rothoffite

CNMNC symbol

Symbol

Adr

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Андрадит

Mineral Dealer

German pages

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Locations with GPS information