Earth Sciences
Collections

Citrine

UNB-2017-0095Minerals » Tectosilicates

Description

Seven samples of Citrine that are yellow-orange in colour and have a vitreous lustre. Samples are short, thick subhedral prismatic crystals that are terminated by a double rhombohedron. Citrine (SiO2) is the clear yellow variety of Quartz. Lustre is greasy or vitreous and streak is white. Hardness is 7. Quartz (Citrine) is usually found as long or short prismatic crystals that are terminated by double rhombohedrons and have striations crosswise. Quartz can also be granular, disseminated or massive in form.

Specifications

Object nameCitrine
IDUNB-2017-0095
Legal statusPermanent collection
CategoryMineral
Classification
Mineral group:
Tectosilicates
Composition
  • CaB2Si2O8(OH,F)2
  • (Ca,Na2,K2)Al2Si4O12•6H2O
  • (Ca,Na)AlSi2O8
  • (Na2,K2)Al2Si4O12•2H2O
  • (Na,Ca)4(Al,Na)3Si9O24(Cl,CO3)2
  • (MAlO2)(SiO 2)x(H2O)y
  • (Na,K)AlSiO4
  • Na2Al2Si3O10·2H2O
  • KAlSi3O8
  • Na2Ca2Al6Si9O30·8H2O
  • K(AlSi2O6)
  • CaAl2Si4O12·4H2O
  • Pectolite NaCa2Si3O8(OH)2H2O with trace amounts of copper
  • (Ca,Na)(Al,Si)4O8
  • SiO2 with water inclusion
  • (Na,Ca)4-8Al6Si6(O,S)24(Cl,SO4)1-2
  • Na8(Al6Si6O24)Cl2
  • CaAl2Si3O10·3H2O
  • SiO2
  • (Cs,Na)2Al2Si4O12·2H2O
  • (Na, Ca)(Al, Si)AlSi2O8
  • KAlSi3O8
  • (Na,K)AlSi3O8
  • (Na,K)AlSi3O8
  • CaAl2Si2O8
  • SiO2
OriginBrazil
Pieces7
PartialYes
Measurements
  • 8cm x 7cm x 3.5cm
  • 5cm x 4.5cm x 1cm
  • 9cm x 7cm x 3cm
  • 7cm x 7cm x 3cm
  • 8cm x 4cm x 2.5cm
  • 26cm x 14cm x 6cm
  • 8.5cm x 4cm x 3cm

Map of Origin

Publications

  • Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.