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Offretite

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Formula:
KCaMgAl
 
5
Si
 
13
O
 
36
· 16H
 
2
O or near
System:HexagonalHardness:4 - 4½
Member of:Zeolite Group


Zeolite Group.

A zeolite difficult to distinguish from Erionite.

NOTE: The zeolite mineral species epitaxially overgrown on lévyne in all cases is identified as erionite (Passaglia et al., 1998).

Classification of Offretite

IMA status:Approved
Strunz 8th edition ID:8/J.26-70
Nickel-Strunz 10th (pending) edition ID:9.GD.25

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites
Dana 8th edition ID:77.1.2.4

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Hey's CIM Ref.:16.10.23

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis
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Type Occurrence of Offretite

Type Locality:Mont Semiol (Mont Semiouse; Mont Simiouse), Châtelneuf, Saint-Georges-en-Couzan, Loire, Rhône-Alpes, France
Year of Discovery:1890

Physical Properties of Offretite

Hardness (Mohs):4 - 4½

Crystallography of Offretite

Crystal System:Hexagonal
Class (H-M):6 m2 - Ditrigonal Dipyramidal
Space Group:P6m2
Cell Parameters:a = 13.29Å, c = 7.58Å
Ratio:a:c = 1 : 0.57
Unit Cell Volume:V 1,159.44 ų (Calculated from Unit Cell)

Epitaxial Relationships of Offretite

Epitaxial Minerals:
Erionite

Optical Data of Offretite

Type:Uniaxial (-)
RI values: nω = 1.489 - 1.495 nε = 1.486 - 1.492
Maximum Birefringence:δ = 0.003

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Offretite

Formula:
KCaMgAl
 
5
Si
 
13
O
 
36
· 16H
 
2
O or near
Simplified for copy/paste:KCaMgAl5Si13O36·16H2O or near
Essential elements:Al, Ca, H, K, Mg, O, Si
All elements listed in formula:Al, Ca, H, K, Mg, O, Si
Common Impurities:Mg

Relationship of Offretite to other Species

Member of:Zeolite Group
Other Members of Group:

- +
Alflarsenite
NaCa
 
2
Be
 
3
Si
 
4
O
 
13
(OH) · 2H
 
2
O
Amicite
K
 
2
Na
 
2
Al
 
4
Si
 
4
O
 
16
· 5H
 
2
O
Ammonioleucite
(NH
 
4
,K)(AlSi
 
2
O
 
6
)
Analcime
Na
 
2
(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
Beaumontite (of Lévy)
Bellbergite
(K,Ba,Sr)
 
2
Sr
 
2
Ca
 
2
(Ca,Na)
 
4
[Al
 
3
Si
 
3
O
 
12
]
 
6
· 30H
 
2
O
Bikitaite
LiAlSi
 
2
O
 
6
· H
 
2
O
Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
· 70H
 
2
O
Brewsterite
Brewsterite-Ba
(Ba,Sr)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Brewsterite-Sr
(Sr,Ba,Ca)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Chabazite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-K
(K
 
2
,Ca,Na
 
2
,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-Levyne Subgroup
Chabazite-Mg
(Mg
 
0.7
K
 
0.5
Ca
 
0.5
Na
 
0.1
)[Al
 
3
Si
 
9
O
 
24
]·10H
 
2
O
Chabazite-Na
(Na
 
2
,K
 
2
,Ca,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-Sr
Sr
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
· 2H
 
2
O
Clinoptilolite-Ca
(Ca,Na,K)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Clinoptilolite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Clinoptilolite-Na
(Na,K,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Cowlesite
CaAl
 
2
Si
 
3
O
 
10
· 6H
 
2
O
Dachiardite-Ca
(Ca,Na
 
2
,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
Dachiardite-Na
(Na
 
2
,Ca,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
Direnzoite
NaK
 
6
MgCa
 
2
(Al
 
13
Si
 
47
O
 
120
) · 36H
 
2
O
Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
Epistilbite
CaAl
 
2
Si
 
6
O
 
16
· 5H
 
2
O
Erionite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Erionite-K
(K
 
2
,Ca,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Erionite-Na
(Na
 
2
,K
 
2
,Ca)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Faujasite Subgroup
Faujasite-Ca
(Ca,Na
 
2
,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Faujasite-Mg
(Mg,Na
 
2
,Ca)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Faujasite-Na
(Na
 
2
,Ca,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Ferrierite
Ferrierite-K
(K
 
2
,Na
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrierite-Mg
(Mg,Na
 
2
,K
 
2
,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrierite-Na
(Na
 
2
,K
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrochiavennite
Ca
 
1-2
Fe[(Si,Al,Be)
 
5
Be
 
2
O
 
13
(OH)
 
2
]•2H
 
2
O
Flörkeite
(K
 
3
Ca
 
2
Na)[Al
 
8
Si
 
8
O
 
32
] · 12H
 
2
O
Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
· 27H
 
2
O
Gaultite
Na
 
4
Zn
 
2
Si
 
7
O
 
18
· 5H
 
2
O
Gismondine
Gismondine-Ba
Ba
 
2
Al
 
4
Si
 
4
O
 
16
· 4-6H
 
2
O
Gismondine-Ca
CaAl
 
2
Si
 
2
O
 
8
· 4H
 
2
O
Gmelinite
Gmelinite-Ca
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gmelinite-K
(K
 
2
,Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gmelinite-Na
(Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
· 12H
 
2
O
Gonnardite
(Na,Ca)
 
2
(Si,Al)
 
5
O
 
10
· 3H
 
2
O
Goosecreekite
Ca[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Gottardiite
Na
 
3
Mg
 
3
Ca
 
5
Al
 
19
Si
 
117
O
 
272
· 93H
 
2
O
Harmotome
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] · 12H
 
2
O
Heulandite-Ba
(Ba,Ca,K,Na,Sr)
 
5
Al
 
9
Si
 
27
O
 
72
· 22H
 
2
O
Heulandite-Ca
(Ca,Na)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-Na
(Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-Sr
(Sr,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Hsianghualite
Ca
 
3
Li
 
2
(Be
 
3
Si
 
3
O
 
12
)F
 
2
Kirchhoffite
Cs(BSi
 
2
O
 
6
)
Laumontite
CaAl
 
2
Si
 
4
O
 
12
· 4H
 
2
O
Leucite
K(AlSi
 
2
O
 
6
)
Lévyne
Lévyne-Ca
(Ca,Na
 
2
,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Lévyne-Na
(Na
 
2
,Ca,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Lovdarite
K
 
2
Na
 
6
Be
 
4
Si
 
14
O
 
36
•9H
 
2
O
Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
· 32H
 
2
O
Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
· 28H
 
2
O or near
Mazzite-Na
Na
 
4
[Al
 
4
Si
 
14
O
 
36
]
 
2
· 30H
 
2
O
Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
· 23H
 
2
O
Mesolite
Na
 
2
Ca
 
2
Si
 
9
Al
 
6
O
 
30
· 8H
 
2
O
Montesommaite
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
· 10H
 
2
O
Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
· 7H
 
2
O
Mutinaite
Na
 
3
Ca
 
4
Si
 
85
Al
 
11
O
 
192
· 60H
 
2
O
Nabesite
Na
 
2
BeSi
 
4
O
 
10
· 4H
 
2
O
Natrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 2H
 
2
O
Natrolite Subgroup
Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
· 38H
 
2
O
Paranatrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 3H
 
2
O
Parthéite
CaAl
 
2
Si
 
2
O
 
8
· 2H
 
2
O
Paulingite
Paulingite-Ca
(Ca,K
 
2
,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Paulingite-K
(K
 
2
,Ca,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Paulingite-Na
(Na
 
2
,K
 
2
,Ca,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
· 15H
 
2
O
Phillipsite-Ca
(Ca
 
0.5
,K,Na,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
.
 
12H2O
Phillipsite-K
(K,Na,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
]
.
 
12H
 
2
O
Phillipsite-Na
(Na,K,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
] · 12H
 
2
O
Pollucite
(Cs,Na)
 
2
(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Roggianite
Ca
 
2
Be(OH)
 
2
Al
 
2
Si
 
4
O
 
13
· 2.5H
 
2
O
Scolecite
CaAl
 
2
Si
 
3
O
 
10
· 3H
 
2
O
Stellerite
Ca[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
Stilbite-Ca
NaCa
 
4
[Al
 
9
Si
 
27
O
 
72
] · nH
 
2
O
Stilbite-Na
(Na,Ca,K)
 
6-7
[Al
 
8
Si
 
28
O
 
72
] · nH
 
2
O
Strontiohurlbutite
SrBe
 
2
(PO
 
4
)
 
2
Terranovaite
(Na,Ca)
 
8
(Si
 
68
Al
 
12
)O
 
160
· 29H
 
2
O
Tetranatrolite
Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
Thomsonite-Sr
Na(Sr,Ca)
 
2
[Al
 
5
Si
 
5
O
 
20
] · 7H
 
2
O
Tschernichite
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 4-8H
 
2
O
Tschörtnerite
Ca
 
4
(Ca,Sr,K,Ba)
 
3
Cu
 
3
[(OH)
 
2
|Al
 
3
Si
 
3
O
 
12
]
 
4
· nH
 
2
O
Wairakite
Ca(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Weinebeneite
CaBe
 
3
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
Wenkite
(Ba,K)
 
4
(Ca,Na)
 
6
[(SO
 
4
)
 
3
|(Si,Al)
 
20
O
 
39
(OH)
 
2
] · 0.5H
 
2
O
Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
Yugawaralite
CaAl
 
2
Si
 
6
O
 
16
· 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
9.GD.05Gmelinite-Ca
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.05Gmelinite-K
(K
 
2
,Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.05Gmelinite-Na
(Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.10Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
9.GD.10Chabazite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
9.GD.10Chabazite-K
(K
 
2
,Ca,Na
 
2
,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
9.GD.10Chabazite-Na
(Na
 
2
,K
 
2
,Ca,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
9.GD.10Chabazite-Sr
Sr
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
9.GD.10Chabazite-Mg
(Mg
 
0.7
K
 
0.5
Ca
 
0.5
Na
 
0.1
)[Al
 
3
Si
 
9
O
 
24
]·10H
 
2
O
9.GD.15Lévyne-Ca
(Ca,Na
 
2
,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.15Lévyne-Na
(Na
 
2
,Ca,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.20Bellbergite
(K,Ba,Sr)
 
2
Sr
 
2
Ca
 
2
(Ca,Na)
 
4
[Al
 
3
Si
 
3
O
 
12
]
 
6
· 30H
 
2
O
9.GD.20Erionite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.20Erionite-K
(K
 
2
,Ca,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.20Erionite-Na
(Na
 
2
,K
 
2
,Ca)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.25Wenkite
(Ba,K)
 
4
(Ca,Na)
 
6
[(SO
 
4
)
 
3
|(Si,Al)
 
20
O
 
39
(OH)
 
2
] · 0.5H
 
2
O
9.GD.30Faujasite-Ca
(Ca,Na
 
2
,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.30Faujasite-Mg
(Mg,Na
 
2
,Ca)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.30Faujasite-Na
(Na
 
2
,Ca,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.35Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
· 32H
 
2
O
9.GD.35Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
· 7H
 
2
O
9.GD.40Dachiardite-Ca
(Ca,Na
 
2
,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
9.GD.40Dachiardite-Na
(Na
 
2
,Ca,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
9.GD.45Epistilbite
CaAl
 
2
Si
 
6
O
 
16
· 5H
 
2
O
9.GD.50Ferrierite-K
(K
 
2
,Na
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
9.GD.50Ferrierite-Mg
(Mg,Na
 
2
,K
 
2
,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
9.GD.50Ferrierite-Na
(Na
 
2
,K
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
9.GD.55Bikitaite
LiAlSi
 
2
O
 
6
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.10.1Bytownite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
16.10.2Lisetite
CaNa
 
2
Al
 
4
Si
 
4
O
 
16
16.10.4Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
16.10.5Gonnardite
(Na,Ca)
 
2
(Si,Al)
 
5
O
 
10
· 3H
 
2
O
16.10.6Mesolite
Na
 
2
Ca
 
2
Si
 
9
Al
 
6
O
 
30
· 8H
 
2
O
16.10.7Faujasite
16.10.8Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
· 27H
 
2
O
16.10.9Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
· 70H
 
2
O
16.10.10Herschelite
16.10.11Phillipsite
16.10.12Fedorite
(Na,K)
 
2-3
(Ca
 
4
Na
 
3
)Si
 
16
O
 
38
F
 
2
· 3.5H
 
2
O
16.10.13Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
16.10.14Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
16.10.15Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
· 7H
 
2
O
16.10.16Reyerite
(Na,K)
 
2
Ca
 
14
(Si,Al)
 
24
O
 
58
(OH)
 
8
· 6H
 
2
O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
· 12H
 
2
O
16.10.21Stilbite
16.10.22Dachiardite
16.10.24Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
· 15H
 
2
O
16.10.25Erionite
16.10.26Paulingite
16.10.27Sodium Dachiardite
(Na
 
2
,Ca,K
 
2
)
 
4-5
Al
 
8
Si
 
40
O
 
96
· 26H
 
2
O
16.10.28Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
· 28H
 
2
O or near
16.10.29Roggianite
Ca
 
2
Be(OH)
 
2
Al
 
2
Si
 
4
O
 
13
· 2.5H
 
2
O

Other Names for Offretite

Synonyms:
Offrétite
Other Languages:
German:Offretit
Russian:Оффретит
Spanish:Offretita

Other Information

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

References for Offretite

Reference List:

- +
Sheppard, R.A. and Gude, A.J. (1969) Chemical composition and physical properties of the related zeolites offretite and erionite. American Mineralogist: 54: 875-886.

Gualtieri, A., G. Artioli, E. Passaglia, S. Bigi, A. Viani, and J.C. Hanson (1998): Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite. American Mineralogist: 83: 590-606.

Passaglia, E., G. Artioli, and A. Gualtieri (1998): Crystal chemistry of the zeolites erionite and offretite. American Mineralogist: 83: 577-589.

Internet Links for Offretite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Offrétite details from Handbook of Mineralogy (PDF)
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  • Localities for Offretite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • Chubut
      • Futaleufú Department
    R. S. Bowman and S. E. Delap (Eds.) Zeolite ’06—7th International Conference on the Occurrence, Properties, and Utilization of Natural Zeolites Socorro, New Mexico USA, 16–21 July 2006 p 242
    Australia
     
    • New South Wales
      • Brisbane Co.
        • Merriwa
    Min Rec (1988) 19:389-406
      • Buckland Co.
    England, B. M. (1996): Zeolites and associated minerals from Borambil, New South Wales, Australia. Austral. J. Mineral. 2, 11-20.
    England, B. M. (2002): Zeolites and associated minerals from the Krui Valley, Merriwa, New South Wales. Austral. J. Mineral. 8, 61-71.
    • Queensland
      • Lockyer Valley Region
        • Gatton Valley
    Brian Camey
    • Tasmania
      • Devonport district
    http://www.crocoite.com/locationbulletins/part1/zeolites.pdf
    http://www.crocoite.com/locationbulletins/part1/zeolites.pdf
      • Moina District (Middlesex District)
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    • Victoria
      • Baw Baw Shire
        • Jindivick
    Tschernich, R. (1992): Zeolites of the World, p.49
        • Willow Grove
      • Flinders area
    Tschernich, R. (1992): Zeolites of the World, p.49
    Min Rec 17:6 p377-379
      • Phillip Island
    Zeolites of Victoria, 1989, W. D. Birch (Ed)
      • Tylden
      • Wellington Shire
        • Howitt Plains
    Austria
     
    • Styria
      • Bad Radkersburg
        • Klöch
    "Aus der Tiefe der Vulkane", Fritz-Jandl-Postl (2011)
    Canada
     
    • British Columbia
      • Kamloops Mining Division
        • Monte Lake
          • Monte Hills
    Tschernich, R. (1992): Zeolites of the World, p.99, 385
        • Westwold
    Tschernich, R. (1992): Zeolites of the World, p.98, 385
      • Similkameen Mining Division
        • Coalmont
    Tschernich, R. (1992): Zeolites of the World, p.300,385
    Costa Rica
     
    • Guanacaste Province
    Micro Probe Vol 7 No. 7 Spring 1993
    • Limón Province
    Tschernich, R. (1992): Zeolites of the World, p.101,301,323,362,386,415,494; Micro Probe Volume VII Number 7 Spring 1993
    • San José Province
      • Bajo Chacones
    Micro Probe Volume VII Number 7 Spring 1993
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Kladno
    Zacek, V., Oplustil, S., Mayova, A. & Meyer, F. R. (1995): Die Mineralien von Kladno in Mittelböhmen, Tschechische Republik. Mineralien-Welt 6 (1), 13-30 (in German).; Pauliš, P.: Nejzajímavější mineralogická naleziště Čech. Kutná Hora: Kuttna, 2000, s. 84-85.; in the collection of Christof Schäfer
        • Mladá Boleslav
          • Bela pod Bezdezem
    Ing. O. Janeček - New localities of Offretite and Cowlesite
      • Hradec Králové Region
        • Jičín (Jitschin; Gitschin)
          • Stupná
    Veselovský, F., Rychlý, R.: Offretit a harmotom z lokality Stupná u Nové Paky. Časopis pro mineralogii a geologii, 1988, roč. 33, č. 1, s. 109-110.
      • Karlovy Vary Region
        • Podbořany (Podersam)
    Offretite from quarry Vrbička near Doupov in Doupovské hory Mts. (Czech Republic) Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 2013
      • Liberec Region
        • Česká Lípa (Böhmisch Leipa)
    L.Hrůzek,O.Janeček
    L.Hrůzek,O.Janeček-Personal references 2012
    Petr Fuchs, ing. Oldřich Janeček
    J.E.Hibsch-Die Minerale des Böhmischen Mittelgebirges (Jena 1934);
    O.Janeček,L.Hrůzek-Personal reference (2011)
      • Ústí Region
        • Děčín (Tetschen)
          • Česká Kamenice
    Levyn a další zeolity z Hackenbergu u České Kamenice
    Zapomenutá lokalita Malá Hůrka u České Kamenice-čas.Minerál 3/2009
    O.Janeček,L.Hrůzek-Zapomenutá lokalita Malá Hůrka u Č.Kamenice.čas.Minerál 3-2009
    O.Janeček,L.Hrůzek
            • Líska
    Janeček O.,Hrůzek L.,Ekrt B.: Nové nálezy zeolitů na Zlatém a Stříbrném vrchu u Lísky u České Kamenice. Minerál, 2013, 21, 6, 528-534.
    Libor Hruzek
        • Litoměřice
    M.Radoň-Významné mineralogické lokality Českého středohoří (čas.Minerál 2/2009)
    M.Radoň-Významné mineralogické lokality Českého středohoří (čas.Minerál 2/2009)
    Finland
     
    • Western and Inner Finland Region
    Lehtinen, Martti 19976. Lake Lappajärvi, a meteorite impact site in western Finland. Geological Survey of Finland, Bulletin 282.
    France
     
    • Auvergne
      • Cantal
        • Murat
          • Laveissière
            • La Grange de Ganilh
    P & E Médard collection
      • Haute-Loire
        • Yssingeaux
          • Araules
    Pongiluppi D. (1976) Offretite, garronite and other zeolites from "Central Massif", France. Bull. SFMC, 99: 322-327
          • Le Mazet-Saint-Voy
    Medard E (2010): zeolithes from central france . article Mindat
    • Midi-Pyrénées
      • Aveyron
        • Mostuejouls
    Boisson, J.-M. & Leconte, J. (2014): Analyses 2012-2013 MNHN-MICROMONTEURS. La revue de Micromonteurs, 21.
        • Sainte-Geneviève-sur-Argence
          • Le Bousquet d'Orlaguet
    JR & C EYTIER collection
    • Rhône-Alpes
      • Ardèche
        • Saint-Martin-de-Valamas
          • Borée
    P & E Médard collection
        • Villeneuve-de-Berg
          • Saint-Jean-le-Centenier
    E. Passaglia et al. , Bull. Minéral. , 1985, 108, pp. 719-724. see also : http://membres.lycos.fr/volcanogeol/prismation/sites_france.htm
      • Loire
        • Saint-Georges-en-Couzan
          • Châtelneuf
    C.R.Acad.Sci.Paris,(1890) 111, 1002-1003
    French Southern and Antarctic Lands
     
    • Kerguelen Islands
    Giret, A., Verdier, O. & Nativel, P. (1992). The zeolitisation of Kerguelen Islands, Southern Indian Ocean. In: Yoshida, Y., et al. (eds) Recent Progress in Antarctic Earth Science, Tokyo: Terra Publishing 32, 1–36. Co., pp. 457–463.
    Germany
     
    • Baden-Württemberg
      • Hegau
        • Immendingen
    in the collection of Christof Schäfer
      • Kaiserstuhl
        • Sasbach
    Bega photo
    WEISENBERGER, T. & SPÜRGIN, S. (2009): Zeolites in alkaline rocks of the Kaiserstuhl Volcanic Complex, SW Germany – new microprobe investigation and the relationship of zeolite mineralogy to the host rock. Geologica Belgica, 12, 75-91. [http://popups.ulg.ac.be/Geol/document.php?id=2682
    • Bavaria
      • Franconia
        • Fichtelgebirge
          • Kemnath
            • Weha
    Keck, E. (2010): Zwei neue Harmotomvorkommen aus dem Kemnather Vulkanfeld in der Oberpfalz. Aufschluss 61, 261-269.
          • Marktredwitz
            • Pechbrunn
    Weiss: "Mineralfundstellen, Deutschland West", 1990
        • Maroldsweisach
    Wittern: "Mineralfundorte in Deutschland", 2001
      • Upper Palatinate
        • Oberpfälzer Wald
          • Mitterteich
            • Wiesau
    Pöllmann, H., (1990): Mineralparagenesen im Nephelinbasanit von Triebendorf/ Opf., Der Aufschluss, Vol. 41(4), 219-226
          • Pressath
            • Atzmannsberg
              • Kuschberg
    http://www.vfmg-weiden.de/min.htm
    • Hesse
      • Gießen (Giessen)
        • Annerod
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Großen-Buseck
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Odenwald
        • Roßdorf
    PETITJEAN collection
      • Vogelsberg
        • Gedern
        • Herbstein
        • Hungen
          • Langd
          • Oberwiddersheim
        • Ortenberg
        • Schotten
          • Gonterskirchen
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • North Rhine-Westphalia
      • Siegerland
        • Neunkirchen
          • Salchendorf
    Klein, E. (1999): Ein Basanit-Vorkommen nordwestlich von Salchendorf bei Neunkirchen / Siegerland. Der Aufschluss, 50, 203-206.
    • Rhineland-Palatinate
      • Eifel
        • Hillesheim
          • Zilsdorf
    Hentschel, G., Neue Mineralfunde aus Mineralvorkommen der Eifel, Mainzer geowiss. Mitt., 87-90, 1982
        • Mayen
          • Ettringen
            • Bellerberg volcano
    Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
      • Westerwald
        • Hundsangen
    Zeolite collection of Volker Betz
        • Linz am Rhein
          • Kalenborn
    Passaglia, E., Gualtieri, A., Marchi, E. (2001): The crystal chemistry of Paulingite, European Journal of Mineralogy. Vol. 13, 113-119
    Hungary
     
    • Nógrád Co.
      • Karancs-Medves Mtns
        • Somoskő
    Szakáll: 100 Hungarian Mineral Locality, 2004
    • Veszprém Co.
      • Balaton Uplands
        • Bazsi
    Mineral Species of Hungary, 2005
          • Prága Hill
    KOVÁCS-PÁLFFY, P. et al. (2005): A Karikás-tető (Prága-hegy, Balaton-felvidék) bazaltjának üregkitöltő ásványai [The cavity filling minerals of the basalt from Karikás-tető (Prága Hill, Balaton Highland, Transdanubia)]. A Magyar Állami Földtani Intézet Évi Jelentése, 95-118. [http://www.mafi.hu/microsites/EJ_digi/EJ_2005PDF/Kovacs_Palffy.pdf]
    Italy
     
    • Lombardy
      • Brescia Province
        • Adamello-Brenta Natural Park
          • Adamello Massif
            • Alta Val Saviore
    Guastoni, A., Dugnami, M., Pezzotta, F., Bardelli, (2002): Offretite del lago d'Arno in alta Val Saviore, Parco dell'Adamello (BS). Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 143, 195-207.
            • Mt. Foppa
    E. Passaglia and A. Tagliavini : "Chabazite-offretite epitaxial overgrowths in cornubianite from Passo Forcel Rosso, Adamello, Italy", European Journal of Mineralogy, 1994, Vol. 6, N° 3, pp. 397-405.
    • Veneto
      • Verona Province
        • Soave
    M.Mattioli, M.Cenni, G.Raffaelli (2008): I minerali del veronese,le mineralizzazioni secondarie delle rocce vulcaniche dei Monti Lessini. Memorie del Museo Civico di Storia Naturale di Verona, II serie - Sezione Scienze della Terra 7 - 2008, 147-153
    Boscardin, M., Checchi, A., Filippi, F., Guglielmino, S., Pegoraro, S., Pretto, G., Zattra, A. (1998): Offrétite del Veneto. Rivista Mineralogica Italiana, 22(1), 25-29. Passaglia, E., Tagliavini. A., Gutoni, R. (1996): Offrétite and other zeolites from Fittà (Verona, Italy). Neues Jahrbuch für Mineralogie, Monatshefte, 1996(9), 418-428.
        • Vestenanuova
    M.Mattioli, M.Cenni, G.Raffaelli (2008): I Minerali del Veronese - Le mineralizzazioni secondarie delle rocce vulcaniche dei Monti Lessini. Memorie del Museo Civico di Storia Naturale di Verona, II° serie - sezione Scienze della Terra 7 - 2008, 196
      • Vicenza Province
        • Chiampo
          • East Lessini Mts.
            • Roccolo Pass
    Daleffe, A. & Boscardin, M. (2005): Offretite di Passo Roccolo tra Chiampo e S. Giovanni Ilarione (Lessini orientali). Studi e Ricerche - Associazione Amici del Museo - Museo Civico "G. Zannato" Montecchio Maggiore (Vicenza), 12, 57-59.
        • Montorso Vicentino
          • Case Nori
    - M.Boscardin, A.Checchi,F.Filippi,S.Guglielmino,S.Pegoraro, G.Pretto & A.Zattra (1998) -Offretite del Veneto- Rivista Mineralogica Italiana, 22, (1),25 - 29.
        • San Pietro Mussolino
    Studi e Ricerche - Associazione Amici del Museo - Museo Civico "G.Zannato" Montecchio Maggiore (VI) 18 Dicembre 1997 , pp. 39 - 43
        • Valdagno
          • Cerealto
    Boscardin, M., Checchi, A., Filippi, F., Guglielmino, S., Pegoraro, S., Pretto, G., Zattra, A. (1998): Offretite del Veneto. Rivista Mineralogica Italiana, 1/1998, 25-30.
    Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
    New Zealand
     
    • North Island
      • Auckland
    NZ Zeolite list and locations. Neville Berkahn, New Zealand Micromineral Group, December 2006
    NZ Zeolite list and locations. Neville Berkahn, New Zealand Micromounters Group, December 2006.
    • South Island
      • Marlborough
    J. Thornton. Zeolites and other minerals on Middlehurst Station. Essence of Microscope (NZ)
    Essence of Micro-Scope, Lookout volcanics, Mt Lookout and Upcot Stations. 2009
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Jawor District
    Eligiusz Szełęg private collection
    Spain
     
    • Canary Islands
      • Las Palmas Province
        • Fuerteventura
          • Pájara
    Tschernich, R. (1992): Zeolites of the World, p. 101, 192, 362, 386, 415.
        • Gran Canaria (Grand Canary)
          • Tasarte
    in the collection of Christof Schäfer
        • Lanzarote
          • Yaiza
            • Playa Blanca
    Tschernich, R. (1992): Zeolites of the World, p. 52, 101, 301, 323, 362, 386, 415, 493.
    UK
     
    • Scotland
      • North West Highlands (Inverness-shire)
        • Isle of Skye
          • Duirinish
            • Dunvegan
    No reference listed
          • Trotternish
            • Staffin
              • Flodigarry
    BMS Database
      • Strathclyde (Ayrshire)
        • Beith
    [BMS]
      • Strathclyde (Renfrewshire)
    BMS Database
    Ukraine
     
    • Crimea Oblast'
      • Crimea peninsula
    Tischenko A. data
    USA
     
    • Arizona
      • Greenlee Co.
        • Shannon Mts
          • Copper Mountain District (Clifton-Morenci District)
            • Clifton
              • San Francisco River area
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 316.
      • Maricopa Co.
    AM61_853
      • Pinal Co.
        • Dudleyville
          • Malpais Hill
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 160, 250; Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56; Thomssen, R.W. (1983), The minerals of Malpais Hill, Pinal Co., AZ, Min.Rec.: 14: 109-113.
    Tschernic Zeolites of the World p.164 (see further rref there)
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 160, 250; Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56; Thomssen, R.W. (1983), The minerals of Malpais Hill, Pinal Co., AZ, Min.Rec.: 14: 109-113.
      • Yavapai Co.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 314.
    • California
      • Del Norte Co.
        • Coastal Range
          • Crescent City area
            • Elk Creek
    Tschernich, 1992. Zeolites of the World, p.164.
      • Los Angeles Co.
    Mineral News v.14 no.9
          • Agoura Hills
    Fred DeVito collection
    Fred DeVito specimen
    • Colorado
      • Jefferson Co.
        • Golden District
          • Golden
    Rocks & Minerals 79:4
    MinRec 19:153
    • Idaho
      • Ada Co.
    Tschernich, R. (1992): Zeolites of the World, 115
      • Adams Co.
    Ream, Lanny R. 2004. Idaho Minerals, 2nd edition, Revised and Updated
      • Idaho Co.
        • Skookumchuck Creek
    Ream, Lanny R. 2004. Idaho Minerals, 2nd edition, Revised and Updated
    • Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    • New Jersey
      • Hudson Co.
        • Secaucus
    Minerals of Laurel Hill, Secaucus, NJ, Facciolla, N.W. (published privately).
    • New Mexico
      • Grant Co.
    Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
    Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
    • Oregon
      • Clackamas Co.
    Micro Probe Vol. 6 No. 4; Tschernich, R. (1992): Zeolites of the World, 116
    Micro Probe Volume VI Number 4
      • Columbia Co.
        • Goble
    Micro Probe Vol. 6 No. 5 Fall 1987; Tschernich, R. (1992): Zeolites of the World, 117
      • Grant Co.
        • Mount Vernon
    Micro Probe Volume VI Number 4
        • North Fork John Day River
    Tschernich, R. (1992): Zeolites of the World, 118
        • Ritter
    Micro Probe Volume VII Number 8 Fall 1993
    Micro Probe Volume VII Number 8 Fall 1993
      • Lake Co.
    Micro Probe Vol. 7 No. 9 Spring 1994; Tschernich, R. (1992): Zeolites of the World, 118
        • Lakeview
    Micro Probe Volume VI Number 4
      • Malheur Co.
        • Lake Owyhee State Park
    Tschernich, R. (1992): Zeolites of the World, 70
      • Wheeler Co.
        • Spray
    Micro Probe Vol. 6 No. 4; Tschernich, R. (1992): Zeolites of the World, 118
    • Washington
      • Cowlitz Co.
    Micro Probe Vol.7 No.9 Spring '94
        • Wolf Point
    Micro Probe Vol. 7 No. 10
      • Douglas Co.
    Minerals of Washington, Bart Cannon 1975; American Mineralogist, Volume 67, pages 799-803, 1982
      • Grays Harbor Co.
        • Porter
    Micro Probe Vol. 7 No. 5 Spring '92
      • Thurston Co.
        • Black Hills
    Zeolites of the World, R. Tschernich, 1991
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