Apophyllite-(KOH)

Overview

KCa4Si8O20(OH,F)·8(H2O)
Fluorescence: none	Barely Detectable Radiation	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.3-2.4 g/cc
Hardness - Mohs	Apophyllite-(KOH) - 4.0-5.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	white, pink, green, yellow, purple
Streak	white

Crystal Properties

Property	Value
Crystal structure	tetragonal - ditetragonal dipyramidal
Cleavage	perfect
Tenacity	brittle
Fracture	brittle
Luster	vitreous, pearly

Similar Minerals

Dana Number : 72.03.01.02

Class: 72

Group: 72.03

Subgroup: 72.03.01 - apophyllite

Dana Number	Mineral Name	Formula
72.03.01.00	apophyllite	KCa4(Si4O10)2F
72.03.01.01	apophyllite-(KF)	(K,Na)Ca4(Si8O20)(F,OH)·8(H2O)
72.03.01.01	fluorapophyllite	(K,Na)Ca4(Si8O20)(F,OH)·8(H2O)
72.03.01.02	apophyllite-(KOH)	KCa4Si8O20(OH,F)·8(H2O)
72.03.01.02	hydroxylapophyllite	KCa4Si8O20(OH,F)·8(H2O)
72.03.01.02	hydroxyapophyllite-(K)	KCa4Si8O20(OH,F)·8(H2O)
72.03.01.04	carletonite	KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O)

Nickel-Strunz Number : 09.EA.15

Group : 09

Subgroup : EA

Nickel-Strunz Number	Mineral Name	Formula
09.EA.15	apophyllite	KCa4(Si4O10)2F
09.EA.15	apophyllite-(KF)	(K,Na)Ca4(Si8O20)(F,OH)·8(H2O)
09.EA.15	apophyllite-(KOH)	KCa4Si8O20(OH,F)·8(H2O)
09.EA.15	fluorapophyllite	(K,Na)Ca4(Si8O20)(F,OH)·8(H2O)
09.EA.15	hydroxyapophyllite-(K)	KCa4Si8O20(OH,F)·8(H2O)
09.EA.15	hydroxylapophyllite	KCa4Si8O20(OH,F)·8(H2O)

Specimens

Localities

Uses