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Lecontite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.00 - 2.50
Solubility +++ H2O
Crystal System orthorhombisch, P212121

Chemism

Chem­ical formula

(NH4,K)Na(SO4)·2H2O

Chem­ical com­po­si­tion

Natrium, Kalium, Sauerstoff, Schwefel, Stickstoff, Wasserstoff

Unit weight: 178.3870967 u; Number of atoms in the formula: 16

Info

Empirical formula:

((NH4)0.75K0.25)Na(SO4)·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.96

7

43.75

1.0079470

7.0556290

Nitrogen

N

5.89

0.75

4.69

14.0067200

10.5050400

Oxygen

O

53.81

6

37.50

15.9994300

95.9965800

Sodium

Na

12.89

1

6.25

22.9897702

22.9897702

Sulfur

S

17.98

1

6.25

32.0655000

32.0655000

Potassium

K

5.48

0.25

1.56

39.0983100

9.7745775

Strunz 9th edi­tion incl. updates

7.CD.15

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
D:
15:Lecontit-Gruppe

Lapis Clas­sifica­tion

VI/C.21-020

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
21: Sehr große Kationen

Clas­sifica­tion by Hölzel

7.CE.200

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
E: Sulfates, C large

Dana 8th edi­tion

29.02.01.01

29: Hydrated Acid and Sulfates
02: Hydrated Acid and Sulfates where (A+)2 XO4 · x(H2O)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.015

Birefringence chart\! Lecontite title=Birefringence chart Lecontite

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

1.440

RI value β

1.454

RI value γ / ε

1.455

Ri mean

1.450

2V angle

Biaxial (-) 30°c

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

222

Space Group number

19

Space Group

P212121

Cell param­e­ters a (Å)

8.24

Cell param­e­ters b (Å)

12.87

Cell param­e­ters c (Å)

6.25

Cell param­e­ters a/b or c/a

0.640

Cell param­e­ters c/b

0.486

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

662.805

X-Ray Pow­der Diffrac­tion

5.068(100),
4.646(60),
3.935(50),
3.802(90),
3.445(60),
3.321(70),
3.033(90),
2.686(80)

XRD chart Lecontite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.00 - 2.50

VHN (Hard­ness Vick­ers)

42 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.737 (berechnet)

1.788 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O

(Co-)Type locality

(Co-)Type locality

Honduras/Comayagua, Departamento/Las Piedras Höhle

Preface

Author (Name, Year)

Taylor, 1858

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 397

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Lecontite

(NH4,K)Na(SO4)·2H2O

orthorhombisch : 222 : P212121

7.CD.15

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Matteuccite

NaHSO4·H2O

monoklin : m : Aa

VI/C.21-010

Lecontite

(NH4,K)Na(SO4)·2H2O

orthorhombisch : 222 : P212121

VI/C.21-020

Eugsterite

Na4Ca(SO4)3·2H2O

VI/C.21-030

Omongwaite

Na2Ca5(SO4)6·3H2O

monoklin : 2 : C2

VI/C.21-035

Hydroglauberite

Na4Ca(SO4)3·2H2O

VI/C.21-040

'Wattevilleite'

Na2Ca(SO4)2·4H2O

VI/C.21-050

Syngenite

K2Ca(SO4)2·H2O

monoklin : 2/m : P21/m

VI/C.21-060

Koktaite

(NH4)2Ca(SO4)2·H2O

monoklin : 2/m : P21/m

VI/C.21-070

Mirabilite

Na2SO4·10 H2O

monoklin : 2/m : P21/c

VI/C.21-080

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Lecontite

(NH4,K)Na(SO4)·2H2O

orthorhombisch : 222 : P212121

7.CE.200

Gypsum

CaSO4·2H2O

monoklin : 2/m : I2/a

7.CE.210

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Lecontite

(NH4,K)Na(SO4)·2H2O

orthorhombisch : 222 : P212121

29.02.01.01

Mirabilite

Na2SO4·10 H2O

monoklin : 2/m : P21/c

29.02.02.01

CNMNC symbol

Symbol

Lcn

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