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Tremolite

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About TremoliteHide

Formula:
☐{Ca2}{Mg5}(Si8O22)(OH)2
The tremolite-actinolite series are defined as calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH), F or Cl.

Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.

Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
Colour:
White, brown, colourless, grey, light green, green, light yellow, pink-violet
Lustre:
Vitreous, Silky
Hardness:
5 - 6
Specific Gravity:
2.99 - 3.03
Crystal System:
Monoclinic
Name:
Named in 1789 by Johann Georg Albrecht Höpfner for the Tremola Valley (Val Tremola), Central St Gotthard Massif, Tessin, Switzerland, where the type material supposedly came from, according to the dealer from whom he had acquired the specimens. However, modern investigations of what is considered the type material, conserved in Geneva, revealed that the true type locality is Campolungo, 14 km further south. (Unlike Campolungo, Val Tremola lies north of the isograd delineating the first appearance of tremolite). This mineral was earlier (1782) called Säulenspath and Sternspath by Johann Ehrenreich von Fichtel for material from Sebeşu de Jos, Transylvania, Romania (for a full account of the early history of tremolite, see Roth, 2006).
Tremolite forms a continuous series with the other minerals in the tremolite-actinolite series. It also forms a continuous series with edenite and richterite. At elevated PT conditions (upper amphibolite - granulite facies), the tremolite-actinolite series minerals also form a continuous series with the hornblende root name group minerals. Intermediate compositions between cummingtonite and tremolite are also known. Tremolite is one of the few amphiboles that can be identified by EDS with reasonable certainty.

06329250014946308307893.jpg
Fibrous habit.
07285060014946308305206.jpg
Byssolite habit
08072630014946308306784.jpg
Star and fan formed aggregates
08946130014946308309038.jpg
single crystal
09611850014946308309759.jpg
Pseudomorph after diopside
08455210014965406201097.jpg
Fibrous habit.
07285060014946308305206.jpg
Byssolite habit
01763500014965587952684.jpg
Star and fan formed aggregates
08946130014946308309038.jpg
single crystal
07568740014999721498942.jpg
Pseudomorph after diopside
00903170014946308318873.jpg
Fibrous habit.
02426990014946308314563.jpg
Byssolite habit
03723880014946308319364.jpg
Star and fan formed aggregates
04956860014946308313656.jpg
single crystal
05508220014946308318666.jpg
Pseudomorph after diopside

Tremolite is an important rock-forming mineral and occurs most commonly as a white to light green, granular to fibrous component of metamorphosed carbonate rocks, especially skarns and dolomite marbles, where the crystals and aggregates can become quite large. Any light colored amphibole in a marble will normally be tremolite. Large isolated and well-terminated crystals are rare. In this environment, it commonly forms as pseudomorphs of tremolite after diopside, but can also be primary. Tremolite is also common in many metamorphosed mafic and ultramafic rocks such as amphibolites and metabasalts although actinolite and other iron-rich amphiboles usually dominate there. Fibrous (asbestiform) tremolite veins are common in many metamorphic rock types, especially where they are carbonate-bearing. In meta-igneous rocks, cummingtonite and anthophyllite can be difficult to distinguish from tremolite, but these are more restricted to metamorphosed Ca-poor ultramafic rocks like serpentinites.

06636960014946308312945.jpg
dark brown tremolite
09717420014946308315902.jpg
green tremolite, colored by Fe
00860840014946308327425.jpg
var. hexagonite, colored by Mn
03730070014946278854124.jpg
var chrome-tremolite colored by Cr and/or V
06636960014946308312945.jpg
dark brown tremolite
01254910014958548433031.jpg
green tremolite, colored by Fe
08167560015144717824665.jpg
var. hexagonite, colored by Mn
03730070014946278854124.jpg
var chrome-tremolite colored by Cr and/or V
06636960014946308312945.jpg
dark brown tremolite
01329160014946308326408.jpg
green tremolite, colored by Fe
00860840014946308327425.jpg
var. hexagonite, colored by Mn
03730070014946278854124.jpg
var chrome-tremolite colored by Cr and/or V

Although the most common color of tremolite is white or other pale colors, it may also be brown, greenish (coloured by Fe), grass green (colored by Cr and/or V) or purple (coloured by Mn).

Tremolite colored by Chrome is often called chrome-tremolite, whereas the purple variety is called hexagonite.

The amphibole varieties byssolite (hair-like fibres), and nephrite can consist, fully or partly, of tremolite.

Tremolite may be highly fibrous to asbestiform, and can then be included in the group of materials called asbestos, though it was rarely used commercially. As with all asbestiform minerals, this fibrous variety is considered carcinogenic if ground into fine dust and inhaled in large amounts, so people should use care in its handling.

For further information, see the tremolite best minerals article, see link: http://www.mindat.org/mesg-86-198178.html

Visit gemdat.org for gemological information about Tremolite.


Classification of TremoliteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.DE.10

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
66.1.3a.1

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
14.6.13

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both

Pronounciation of TremoliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of TremoliteHide

Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
White, brown, colourless, grey, light green, green, light yellow, pink-violet
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
Parting:
on {010} {100}
Fracture:
Splintery
Density:
2.99 - 3.03 g/cm3 (Measured)    2.964 g/cm3 (Calculated)

Optical Data of TremoliteHide

Type:
Biaxial (-)
RI values:
nα = 1.599 - 1.612 nβ = 1.613 - 1.626 nγ = 1.625 - 1.637
2V:
Measured: 88° to 80°, Calculated: 82° to 84°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of TremoliteHide

Formula:
☐{Ca2}{Mg5}(Si8O22)(OH)2

The tremolite-actinolite series are defined as calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH), F or Cl.

Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.

Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
IMA Formula:
◻Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2
Common Impurities:
Ti,Mn,Al,Na,K,F,Cl,H2O

Crystallography of TremoliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.84 Å, b = 18.02 Å, c = 5.27 Å
β = 104.95°
Ratio:
a:b:c = 0.546 : 1 : 0.292
Unit Cell V:
902.83 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated, stout prismatic, bladed, fibrous, granular, columnar crystals and aggregates.

Twinning:
Simple or multiple: common parallel to {100}, rarely parallel to {001}

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
3.12 Å(100)
8.38 Å(100)
2.71 Å(90)

Type Occurrence of TremoliteHide

Geological Setting of Type Material:
Dolomite marble

Synonyms of TremoliteHide

Other Language Names for TremoliteHide

Varieties of TremoliteHide

Chrome-TremoliteA Cr-bearing tremolite.
Chromian tremolite
HexagoniteSupposedly a hexagonal form of tremolite, but shown to be monoclinic. A Mn-bearing variety distinguished by its pale lilac to purplish color.

Relationship of Tremolite to other SpeciesHide

Other Members of this group:
Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2Mon. 2/m : B2/m
Ferro-actinolite☐{Ca2}{Fe2+5}(Si8O22)(OH)2Mon.
Ferro-fluoro-actinolite☐{Ca2}{Fe5}(Si8O22)F2
Fluoro-tremolite☐{Ca2}{Mg5}(Si8O22)F2Mon. 2/m : B2/m
Forms a series with:

Common AssociatesHide

CalciteCaCO3
DiopsideCaMgSi2O6
DolomiteCaMg(CO3)2
Associated Minerals Based on Photo Data:
Quartz41 photos of Tremolite associated with Quartz on mindat.org.
Calcite39 photos of Tremolite associated with Calcite on mindat.org.
Pyrite30 photos of Tremolite associated with Pyrite on mindat.org.
Fluor-uvite29 photos of Tremolite associated with Fluor-uvite on mindat.org.
Diopside23 photos of Tremolite associated with Diopside on mindat.org.
Manganocummingtonite14 photos of Tremolite associated with Manganocummingtonite on mindat.org.
Talc13 photos of Tremolite associated with Talc on mindat.org.
Scapolite12 photos of Tremolite associated with Scapolite on mindat.org.
Epidote11 photos of Tremolite associated with Epidote on mindat.org.
Magnetite11 photos of Tremolite associated with Magnetite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DE.Clino-suenoite□{Mn2+2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.05Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2Mon.
9.DE.05Clino-holmquistite Root Name☐{Li2}{Z2+3Z3+2}(Si8O22)(OH,F,Cl)2Mon.
9.DE.05Grunerite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.05Permanganogrunerite☐{Mn2+2}{Mn2+5}(Si8O22)(OH)2Mon.
9.DE.05Ferri-fluoro-leakeite{Na}{Na2}{Mg2Fe3+2Li}(Si8O22)F2Mon. 2/m : B2/m
9.DE.10Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.10Ferri-tschermakite☐{Ca2}{Mg3Fe3+2}(Al2Si6O22)(OH)2Mon.
9.DE.10Ferro-actinolite☐{Ca2}{Fe2+5}(Si8O22)(OH)2Mon.
9.DE.10Ferro-hornblende☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2Mon.
9.DE.10Ferro-tschermakite☐{Ca2}{Fe2+3Al2}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.10Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
9.DE.10Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.10Tschermakite☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.10CannilloiteCa(Ca2)(Mg4Al)(Al3Si5O22)(OH)2Mon.
9.DE.10Fluoro-cannilloite{Ca}{Ca2}{Mg4Al}(Al3Si5O22)(F,OH)2Mon.
9.DE.10Parvo-manganotremolite☐{CaMn2+}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.10Fluoro-tremolite☐{Ca2}{Mg5}(Si8O22)F2Mon. 2/m : B2/m
9.DE.15Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2Mon.
9.DE.15Ferro-edenite{Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2Mon.
9.DE.15Ferro-kaersutite{Na}{Ca2}{Fe2+3AlTi}(Al2Si6O22)O2Mon.
9.DE.15Ferro-pargasite{Na}{Ca2}{Fe2+4Al}(Al2Si6O22)(OH)2Mon.
9.DE.15Hastingsite{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2Mon.
9.DE.15Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2Mon.
9.DE.15Magnesio-hastingsite{Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2Mon.
9.DE.15Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2Mon.
9.DE.15Sadanagaite{Na}{Ca2}{Mg3Al2}(Si5Al3O22)(OH)2Mon.
9.DE.15Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2Mon. 2/m : P2/m
9.DE.15Potassic-ferro-ferri-sadanagaite{K}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)(OH)2Mon.
9.DE.15Potassic-sadanagaite{K}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2Mon.
9.DE.15Potassic-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2Mon.
9.DE.15Potassic-ferro-sadanagaite{K}{Ca2}{Fe2+3Al2}(Al3Si5O22)(OH)2Mon.
9.DE.15Magnesio-fluoro-hastingsite{Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)F2Mon. 2/m : B2/m
9.DE.15Potassic-fluoro-hastingsite{K}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(F,OH)2Mon. 2/m : B2/m
9.DE.15Potassic-chloro-hastingsite{K}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(Cl,OH)2Mon. 2/m : B2/m
9.DE.15Fluoro-pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(F,OH)2Mon. 2/m : B2/m
9.DE.15Parvo-mangano-edenite{Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-chloro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(Cl,OH)2
9.DE.15Potassic-ferro-chloro-edenite{K}{Ca2}{Fe2+5}(AlSi7O22)(Cl,OH)2
9.DE.15Potassic-magnesio-hastingsite{K}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-ferro-pargasite{K}{Ca2}{Fe2+4Al}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.15Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-fluoro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)F2Mon. 2/m : B2/m
9.DE.15Ferri-kaersutiteNaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2Mon. 2/m : B2/m
9.DE.15Vanadio-pargasiteNaCa2(Mg3+4V)(Al2Si6)O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-taramiteNa(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.20Barroisite☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2Mon.
9.DE.20Ferro-ferri-barroisite☐(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-winchite☐[CaNa][Fe2+4(Fe3+,Al)]Si8O22(OH)2
9.DE.20Ferri-barroisite☐(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-taramiteNa(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2
9.DE.20Ferro-ferri-katophoriteNa(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-barroisite☐{CaNa}{Fe2+3Al2}(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-richterite{Na}{CaNa}{Fe2+5}(Si8O22)(OH)2Mon.
9.DE.20Ferro-winchite ☐{CaNa}{Fe2+4Al}(Si8O22)(OH)2Mon.
9.DE.20Ferro-katophorite{Na}{CaNa}{Fe2+4Al}[(AlSi7)O22](OH)2
9.DE.20Ferri-katophoriteNa(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2Mon.
9.DE.20Ferri-taramiteNa(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2Mon.
9.DE.20Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2Mon.
9.DE.20Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.20Winchite☐{CaNa}{Mg4Al}(Si8O22)(OH)2Mon. 2/m
9.DE.20Taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.20Fluoro-richterite{Na}{CaNa}{Mg5}(Si8O22)(F,OH)2Mon. 2/m
9.DE.20Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2Mon. 2/m : B2/m
9.DE.20Potassic-fluoro-richterite{K}{CaNa}{Mg5}(Si8O22)(F,OH)2Mon.
9.DE.20Potassic-richterite{K}{CaNa}{Mg5}Si8O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferri-ghoseite☐[Mn2+Na][Mg4Fe3+]Si8O22(OH)2Mon. 2/m
9.DE.20Ferri-winchite☐[CaNa][Mg4(Fe3+,Al)]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.20Fluoro-taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)F2Mon. 2/m : B2/m
9.DE.20Fluoro-katophoriteNa(CaNa)(Mg4Al)(AlSi7O22)F2Mon.
9.DE.20Ferri-fluoro-katophoriteNa(CaNa)(Mg4Fe3+)(AlSi7O22)F2Mon. 2/m : B2/m
9.DE.25Arfvedsonite[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25EckermanniteNaNa2(Mg4Al}Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-eckermanniteNaNa2(Fe2+4Al)Si8O22(OH)2Mon.
9.DE.25Ferro-glaucophane◻[Na2][Fe2+3Al2]Si8O22(OH)2Mon.
9.DE.25Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2Mon.
9.DE.25Potassic-mangani-leakeite[(Na,K)][Na2][Mg2Mn3+2Li]Si8O22(OH)2Mon.
9.DE.25Mangano-ferri-eckermannite{Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2Mon.
9.DE.25Ferri-leakeite[Na][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Magnesio-riebeckite◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2Mon.
9.DE.25Magnesio-arfvedsonite{Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25NybøiteNaNa2(Mg3Al2)(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.25Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Mangano-mangani-ungarettiiteNaNa2(Mn2+2Mn3+3)(Si8O22)O2Mon.
9.DE.25Ferro-ferri-nybøiteNaNa2[(Fe2+3,Mg)Fe3+2](AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.25Clino-ferro-ferri-holmquistite◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25Ferri-nybøiteNaNa2(Mg3Fe3+2](AlSi7O22)(OH)2Mon.
9.DE.25Ferro-ferri-leakeite[Na][Na2][Fe2+2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Ferro-ferri-fluoro-leakeiteNa(Na2)(Fe2+2Fe3+2Li)(Si8O22)(F)2Mon.
9.DE.25Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Mon.
9.DE.25Magnesio-fluoro-arfvedsonite[Na][Na2][Mg4Fe3+][Si8O22](F,OH)2Mon.
9.DE.25Ferri-pedrizite[Na][Li2][Mg2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Potassic-ferri-leakeite[K][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Fluoro-nybøiteNaNa2(Mg3Al2)(AlSi7O22)(F,OH)2Mon. 2/m : B2/m
9.DE.25Mangani-dellaventuraite{Na}{Na2}{MgMn3+2LiTi4+}Si8O22O2Mon. 2/m : B2/m
9.DE.25Fluoro-pedriziteNaLi2(Mg2Al2Li)(Si8O22)F2Mon. 2/m : B2/m
9.DE.25Potassic-arfvedsonite[(K,Na)][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Mangani-obertiiteNa(Na2)(Mg3Mn3+Ti)(Si8O22)O2Mon. 2/m : B2/m
9.DE.25Potassic-magnesio-fluoro-arfvedsonite[(K,Na)][Na2][Mg4Fe3+][Si8O22][(F,OH)2]
9.DE.25Ferro-ferri-pedrizite[Na][Li2][Fe2+2Fe3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Potassic-magnesio-arfvedsonite[K][Na2][Mg4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25PedriziteNaLi2(LiMg2Al2)(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-pedriziteNaLi2(Fe2+2Al2Li)Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-fluoro-pedrizite{Na}{Li2}{Fe2Al2Li}(Al2Si6O22)F2Mon. 2/m : B2/m
9.DE.25Fluoro-leakeiteNaNa2(Mg2Al2Li)(Si8O22)F2Mon. 2/m : B2/m
9.DE.25Ferro-ferri-obertiiteNaNa2(Fe2+3Fe3+Ti)Si8O22O2Mon. 2/m : B2/m
9.DE.25Ferri-obertiiteNa(Na2)(Mg3Fe3+Ti)(Si8O22)O2Mon. 2/m : B2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

66.1.3a.4Alumino-magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
66.1.3a.6Aluminotschermakite☐{Ca2}{Mg3Al2}(Al2Si6O22)(OH)2Mon.
66.1.3a.10Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2Mon.
66.1.3a.12Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2Mon.
66.1.3a.16Magnesiosadanagaite{Na}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2Mon. 2/m
66.1.3a.18Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.6.1CombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
14.6.2PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2OMon.
14.6.5TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2OMon. 2/m : P2/b
14.6.7RhodesiteKHCa2Si8O19 · 5H2OOrth. mmm (2/m 2/m 2/m)
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
14.6.9ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
14.6.10MonticelliteCaMgSiO4Orth.
14.6.11MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
14.6.12DiopsideCaMgSi2O6Mon. 2/m : B2/b

Other InformationHide

Health Risks:
Asbestiform varieties of tremolite can cause lung disease when inhaled, as with other species of asbestos minerals.
This mineral is known to be a respirable carcinogen, and is an uncommon form of asbestos. Exposure to very dusty air or long-term exposure to low level airborne dusts containing fine fibres of the mineral has been found to cause a high risk of serious lung disease including mesothelioma and lung cancer. Care should be taken working with samples that contain fibrous forms of this mineral, to avoid creating or inhaling dusts. Non-fibrous forms, such as in many amphibolites, are safer to handle, but can still produce potentially carcinogenic respirable fibre when crushed. Appropriate dust masks should be worn if working in areas which have dusts likely to be rich in this mineral. Storage and careful handling of specimens has little or no risk.

References for TremoliteHide

Reference List:
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Fichtel, J.E.v. (1782) Geschichte und Beschreibung einer in Siebenbürgen neu entdeckten Steinart, welche man Säulenspath und Sternspath nennen könnte. Schriften der Berlinischen Gesellschaft naturforschender Freunde 3, 442-455. [as Säulenspath and Sternspath]
Höpfner, J.G.A. (1789) I. Ueber die Klassifikation der Fossilien in einem Schreiben des Herausgebers an Herrn Dr. Karsten in Halle. II. Versuch einer neuen Classifikationsmethode der Stein- und Erdarten, nach den neuesten chemischen Erfahrungen. Magazin für die Naturkunde Helvetiens: 4: 255-332.
Von Buch L. (1809) Der Gesellschaft naturforschender Freunde zu Berlin Magazin für die neuesten Entdeckungen in der gesammten Naturkunde, 3, p. 172.
Stemple, I.S. and Brindley, G.W. (1960) A structural study of talc and talc-tremolite relations. Journal of the American Ceramic Society: 43: 34-43.
Ross, M., Smith, W.L., Ashton, W.H. (1968) Triclinic talc and associated amphiboles from Gouverneur mining district, New York. American Mineralogist 53: 763-765.
Hawthorne, F.C., Grundy, H.D. (1976) The crystal chemistry of the amphiboles; IV, X-ray and neutron refinements of the crystal structure of tremolite. The Canadian Mineralogist: 14: 334-345.
Hawthorne, F.C., Della Ventura, G., Robert, J.-L. (1996) Short-range order of (Na,K) and Al in tremolite: An infrared study. American Mineralogist: 81: 782-784.
Deer, W.A., Howie, R.A., Zussman, J. (1997) Rock-forming Minerals: Double-Chain Silicates, Volume 2B. Geological Society of London.
Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.
Ishida, K. Hawthorne, F.C., Ando, Y. (2002) Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series. American Mineralogist: 87: 891-898.
Roth, P. (2006) The early history of tremolite. Axis: 2(3): 1-10. (http://www.minrec.org/pdfs/TREMOLITE%20Edited.pdf)
Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist: 44(1): 1-21.

Internet Links for TremoliteHide

Localities for TremoliteHide

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