Gwihabaite | SSHADE

Processing math: 52%

Mineral phase

IMA name: Gwihabaite

Class: non-silicate mineral
Compound type: nitrate

Chemical composition

Formula: $(NH_4,K)(NO_3)$
Chemical formula: (NH4,K)NO3
Elemental formula: (K+)0-1 (N+)1-2 (H)0-4 O (O-)2
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$K^+$	Potassium(1+) cation	element	0 - 1		constituent cation	main
	$NH_4^+$	Ammonium ion	molecule	0 - 1		constituent cation	main
	$(NO_3)^-$	Nitrate anion	chemical function	1		anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$H_4 >\mid N^+$	1
	$(NO_3)^-$	1

Chemical bonds

	Bond	Number
	$>\mid N^+ \cdot O^{-}-$
	$K^+ \cdot O^{-}-$
	$\geq N^+-H$	4
	$\dddot - \dddot - N^+ \dddot - O^{-2/3}$	3

Oxides composition

Oxides

Formula	$K_{2}O$	$N_{2}O_{5}$
Mass fraction (%)

Oxides comments

calculated with N2O5 as (NH4)2O

Classifications

Strunz

Class: carbonates - nitrates (05)
Division: nitrates (05.N)
Family: without OH or H2O (05.NA)
Code: 05.NA.15

Dana

Major class: carbonates, nitrates, borates (V)
Class: simple nitrates (18)
Type: where A xNO3·x(H2O), x can equal zero (18.01)
Group: Niter series (18.01.02)
Code: 18.01.02.02

Crystallography

Phase type: crystalline
Crystal system: orthorhombic
Crystal class: dipyramidal
Crystal class symbol: mmm (D2h)
Crystal spacegroup: Pmmm

Physical properties

Molar mass: 85.31 $g/mol$
Density: 1.77 (1.80 calculated) $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.141
Refraction index $n_{\alpha}$: 1.458
Refraction index $n_{\beta}$: 1.527
Refraction index $n_{\gamma}$: 1.599
Dispersion V: none
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent
Luster: vitreous

Links and Publications

Links