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Johnkoivulaite

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Formula:
Cs(Be2B)Mg2Si6O18
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.01
Member of:
Name:
Named in honour of GIA (Gemological Institute of America) researcher John Koivula for his many contributions in gemstone research (especially inclusions in gemstones) and photomicrography.
Unique combination of elements.

Note: no chemical formula given on cited GIA web page.

"This mineral is especially unique due to the strong pleochroism it shows from deep violet to nearly colorless when observed with polarized light".


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Classification of JohnkoivulaiteHide

Approved
Approval Year:
2019
Approval History:
IMA 2019-046

Physical Properties of JohnkoivulaiteHide

Vitreous
Hardness:
7½ on Mohs scale
Fracture:
Conchoidal
Density:
3.01 g/cm3 (Measured)    

Chemical Properties of JohnkoivulaiteHide

Formula:
Cs(Be2B)Mg2Si6O18

Type Occurrence of JohnkoivulaiteHide

Relationship of Johnkoivulaite to other SpeciesHide

Member of:
Other Members of this group:
Avdeevite(Na,Cs)(Be2Li)Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3
StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc

Fluorescence of JohnkoivulaiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for JohnkoivulaiteHide

Reference List:
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Internet Links for JohnkoivulaiteHide

Localities for JohnkoivulaiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Myanmar (TL)
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
https://www.gia.edu/gia-news-press/new-mineral-named-for-john-koivula?
 
Mineral and/or Locality  
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