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Itsiite

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About ItsiiteHide

Formula:
Ba2Ca(BSi2O7)2
Colour:
Colorless and light blue to medium greenish-blue
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.644 (Calculated)
Crystal System:
Tetragonal
Name:
Itsiite is named for the Itsi Mountain Range, a spectacular, glaciated, multi-peaked massif within the Selwyn Mountains proper. “Itsi” means “wind” in the language of the Kaska, a First Nations people of the area.
Structurally related to hyalotekite and kapitsaite-(Y).


Classification of ItsiiteHide

Approved
Approval Year:
2013

Physical Properties of ItsiiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless and light blue to medium greenish-blue
Streak:
White
Hardness:
5½ on Mohs scale
Comment:
Based on scratch test
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
Fracture:
Splintery
Density:
3.644 g/cm3 (Calculated)
Comment:
Could not be measured because the crystals are generally heavily included with cerchiaraite-(Fe)

Optical Data of ItsiiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.623() nε = 1.619(1)
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of ItsiiteHide

Formula:
Ba2Ca(BSi2O7)2

Crystallography of ItsiiteHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2m
Setting:
I4 2m
Cell Parameters:
a = 10.9515(5) Å, c = 10.3038(7) Å
Ratio:
a:c = 1 : 0.941
Unit Cell V:
1235.79 ų
Z:
4
Morphology:
Tetragonal plates flattened on {001} and exhibit the forms {001}, {101}, and {112}; ; the forms {101} and {112} are generally striated.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.764(100)
3.446(60)
3.100(51)
2.899(96)
2.279(44)
2.145(69)
1.758(43)
Comments:
From Type Description.

Type Occurrence of ItsiiteHide

General Appearance of Type Material:
As intergrowths of tetragonal plates up to 1 mm across. Crystals of Itsiite are commonly heavily included with cerchiaraite-(Fe)
Place of Conservation of Type Material:
Type material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue number 64072
Geological Setting of Type Material:
Ba-rich skarn deposit associated with a quartz monzonite. Itsiite found in low temperature, late-stage veins
Associated Minerals at Type Locality:

Synonyms of ItsiiteHide

Relationship of Itsiite to other SpeciesHide

Other Members of this group:
Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
Kapitsaite-(Y)(Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28FTric. 1 : P1
Khvorovite(Pb,Ba,K)4Ca2[Si8B2(Si,B)2O28]FTric.

Fluorescence of ItsiiteHide

non-fluorescent

Other InformationHide

Notes:
Slowly decompose in concentrated HCl (about 1 h) and are unreactive in concentrated H2SO4 (days).
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 ItsiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Peterson, R.C., Joy, B.R. (2013) Itsiite, IMA 2013-085. CNMNC Newsletter No. 18, December 2013, page 3255; Mineralogical Magazine: 77: 3249-3258.
Kampf, A.R., Peterson, R.C., Joy, B.R. (2014) Itsiite, Ba2Ca(BSi2O7)2, a new mineral species from Yukon, Canada: Description and crystal structure. Canadian Mineralogist: 52: 401-407.

Internet Links for ItsiiteHide

Localities for ItsiiteHide

ⓘ - 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.
Canada (TL)
 
  • Yukon
    • Watson Lake mining district
      • Itsi Mt.
        • Wilson Lake
          • Gun claim (Gunn claim)
Kampf, A.R., Peterson, R.C., Joy, B.R. (2014): Itsiite, Ba2Ca(BSi2O7)2, a new mineral species from Yukon, Canada: Description and crystal structure. Canadian Mineralogist, 52, 401-407.
Mineral and/or Locality  
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