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Grandidierite

Pictures (5 Images total)

Grandidierite
Views (File:
1570217636
): 2621
Grandidierite
Grandidierite specimen, from Vohibola phlogopite deposit, Behara, Amboasary Sud, Anosy, Madagascar; Dimensions: 48 mm x 36 mm x 27 mm
Copyright: pegmatite; Contribution: pegmatite
Location: Madagaskar/Anosy, Region/Amboasary, Distrikt
Mineral: Grandidierite
Image: 1570217636
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Grandidierite

Grandidierite specimen, from Vohibola phlogopite deposit, Behara, Amboasary Sud, Anosy, Madagascar; Dimensions: 48 mm x 36 mm x 27 mm
Copyright: pegmatite
Contribution: pegmatite 2019-10-04
Locality: Amboasary, Distrikt / Anosy, Region / Madagaskar
Grandidierit
Views (File:
1215316799
): 8540
Grandidierit
Fundort: Cap Andrahomana, Ranopiso Dept., Anosy (Fort Dauphin) Region, Tulear (Toliara) Provinz, Madagaskar; Größe: 2,5 x 2 cm
Copyright: Rob Lavinsky; Contribution: Collector
Location: Madagaskar/Anosy, Region/Taolanaro, Distrikt/Ranopiso/Cap Andrahomana
Mineral: Grandidierite
Image: 1215316799
Rating: 8 (votes: 2)
License: Usage for Mineralienatlas project only
Grandidierit

Fundort: Cap Andrahomana, Ranopiso Dept., Anosy (Fort Dauphin) Region, Tulear (Toliara) Provinz, Madagaskar; Größe: 2,5 x 2 cm
Copyright: Rob Lavinsky
Contribution: Collector 2008-07-06
Locality: Cap Andrahomana / Ranopiso / Taolanaro, Distrikt / Anosy, Region / Madagaskar
Grandidierit
Views (File:
1109176216
): 7025
Grandidierit
Größe: 4 x 6 x 2.5 cm; Fundort: Cap Andrahomana, Fort. Dauphin Area, Toliara Province, Madagaskar
Copyright: Kiyoshi Kiikuni; Contribution: Mineralienatlas
Location: Madagaskar/Anosy, Region/Taolanaro, Distrikt/Ranopiso/Cap Andrahomana
Mineral: Grandidierite
Image: 1109176216
License: Usage for Mineralienatlas project only
Grandidierit

Größe: 4 x 6 x 2.5 cm; Fundort: Cap Andrahomana, Fort. Dauphin Area, Toliara Province, Madagaskar
Copyright: Kiyoshi Kiikuni
Contribution: Mineralienatlas 2005-02-23
Locality: Cap Andrahomana / Ranopiso / Taolanaro, Distrikt / Anosy, Region / Madagaskar
Grandidierit
Views (File:
1479204006
): 5484
Grandidierit
Grandidierit; Kap Andrahomana,Madagaskar; BB: 5 cm
Copyright: Rockhounder; Contribution: Rockhounder
Collection: Rockhounder
Location: Madagaskar/Anosy, Region/Taolanaro, Distrikt/Ranopiso/Cap Andrahomana
Mineral: Grandidierite
Image: 1479204006
License: Usage for Mineralienatlas project only
Grandidierit

Grandidierit; Kap Andrahomana,Madagaskar; BB: 5 cm
Collection: Rockhounder
Copyright: Rockhounder
Contribution: Rockhounder 2016-11-15
Locality: Cap Andrahomana / Ranopiso / Taolanaro, Distrikt / Anosy, Region / Madagaskar
Grandidierit
Views (File:
1506263541
): 4491
Grandidierit
Cap Andrahomana, Ranopiso Dept., Anosy (Fort Dauphin) Region, Tulear (Toliara) Provinz, Madagaskar; Größe: 4x3x4,5cm; Gewicht: 98 ct
Copyright: smaragd123; Contribution: smaragd123
Collection: smaragd123
Location: Madagaskar/Anosy, Region/Taolanaro, Distrikt/Ranopiso/Cap Andrahomana
Mineral: Grandidierite
Image: 1506263541
License: Usage for Mineralienatlas project only
Grandidierit

Cap Andrahomana, Ranopiso Dept., Anosy (Fort Dauphin) Region, Tulear (Toliara) Provinz, Madagaskar; Größe: 4x3x4,5cm; Gewicht: 98 ct
Collection: smaragd123
Copyright: smaragd123
Contribution: smaragd123 2017-09-24
Locality: Cap Andrahomana / Ranopiso / Taolanaro, Distrikt / Anosy, Region / Madagaskar

Collectors Summary

Color bläulichgrün
Streak color weiß
Hardness (Mohs) 7.5
Solubility - Säuren
Crystal System orthorhombisch, Pbnm

Chemism

Chemical formula

(Mg,Fe2+)Al3(BO4)(SiO4)O

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Bor, Sauerstoff

Unit weight: 296.0268096 u; Number of atoms in the formula: 15

Info

Empirical formula:

(Mg0.75Fe0.25)Al3(BO4)(SiO4)O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

3.65

1

6.67

10.8117000

10.8117000
Oxygen

O

48.64

9

60.00

15.9994300

143.9948700
Magnesium

Mg

6.16

0.75

5.00

24.3050600

18.2287950
Aluminium

Al

27.34

3

20.00

26.9815382

80.9446146
Silicon

Si

9.49

1

6.67

28.0855300

28.0855300
Iron

Fe

4.72

0.25

1.67

55.8452000

13.9613000

Analysis wt%

SiO2 : 20.39, Al2O3 : 52.12, Fe2O3 : 0.80, FeO : 2.87, MgO : 12.04, B2O3 : 11.57 (Ref: Mineralogical Magazine 65)

Strunz 9th edition incl. updates

9.AJ.05

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
J: Insel(Neso)silikate mit BO3 Triangeln und /oder B[4], Be[4] Tetraedern, eckenteilend mit SiO4
05:Grandidierit-Gruppe

Lapis Classification

VIII/B.31-040

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
31: Kationen mit Koordinationszahlen zwischen [8] und [12]; Beryllium- und Bor-Inselsilikate

Classification by Hölzel

9.AK.140

9: SILICATES
A: Nesosilicates
K: Boro and Beryllo Nesosilicates
1: C small; Dumortierite-Kornerupine-Group

Dana 8th edition

54.01.01.01

54: Nesosilicates Nesosilicate Borosilicates and Some Beryllosilicates
01: Nesosilicates Nesosilicate Borosilicates and Some Beryllosilicates with (BO3)
01: Grandidierite Group

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

bläulichgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.035~
Birefringence chart\! Grandidierite title=Birefringence chart Grandidierite

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

1.596

RI value β

1.63

RI value γ / ε

1.63

Ri mean

1.619

2V angle

Biaxial (-) 30°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

10.34

Cell parameters b (Å)

10.98

Cell parameters c (Å)

5.76

Cell parameters a/b or c/a

0.942

Cell parameters c/b

0.525

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

653.951

X-Ray Powder Diffraction

5.482(90),
5.17(100),
5.04(100),
3.708(70),
2.956(50),
2.744(90),
2.584(70),
2.166(80)
XRD chart Grandidierite

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)

7.5

VHN (Hardness Vickers)

1650 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.976

3.007 ( ρ calc. Mineralienatlas )

Instability

- Säuren

(Co-)Type locality

(Co-)Type locality

Madagaskar/Anosy, Region/Taolanaro, Distrikt/Ranopiso/Cap Andrahomana

Preface

Author (Name, Year)

Lacroix, 1902

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 301

Other languages

German

Grandidierit

Spanish

Grandidierita

French

Grandidierite

English

Grandidierite

Russian

Грандидьерит

CNMNC symbol

Symbol

Gdd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 4xOlo7E_B0Genu95WJyTzw
GUID (Global unique identifier) A3A513E3-3FB1-4107-9E9E-EF79589C93CF
Database ID 1439