Chalcedony

Overview

SiO2
Fluorescence: yellow-orange under SW and LW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.6 g/cc
Hardness - Mohs	Chalcedony - 6.5-7  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	colorless, white, gray, blue, multiple
Streak	white

Crystal Properties

Property	Value
Crystal structure	trigonal - trapezohedral
Cleavage	none
Tenacity	brittle
Fracture	conchoidal
Luster	waxy

Similar Minerals

Dana Number : 75.01.03.01

Class: 75

Group: 75.01

Subgroup: 75.01.03 - quartz

Dana Number	Mineral Name	Formula
75.01.03.01	amethyst	SiO2
75.01.03.01	chalcedony	SiO2
75.01.03.01	chrysoprase	SiO2
75.01.03.01	quartz	SiO2

Nickel-Strunz Number : 04.DA.05

Group : 04

Subgroup : DA

Nickel-Strunz Number	Mineral Name	Formula
04.DA.05	amethyst	SiO2
04.DA.05	chalcedony	SiO2
04.DA.05	chrysoprase	SiO2
04.DA.05	quartz	SiO2

Specimens

Localities

Uses