This is one of the original Malpais Hill localities mentioned in Thomssen (1983). It is within a railroad cut of the Copper Basin railroad, through the eastern flank of Malpais Hill in basalt rock. Mineralization is in miarolytic cavities and voids between basalt masses/pillows. NOTE: Accurate GPS coordinates obtained January, 2007, by Mr. Ron Deblois.

Note: Celadonite has been reported from this locality (see references below). Several unusual green to greenish gray minerals with acicular habit have subsequently been found at the locality and have also been attributed to celadonite. The original references indicate that the so-called celadonite, had a "similar" infra-red spectrum without discussion of the implied problem. There was a comment that the chemical composition of the alleged celadonite differed from what would be expected for celadonite, as the species was defined at that time. Additional apparently unstudied materials are known from the locality. One interesting material occurs as gnarled acicular greenish gray clusters. Another form which may or may not be celadonite occurs as velvety green crystal coatings and spherical clusters lining cavities. New mineral studies of the locality are needed.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Calcite

ⓘ 'Erionite Subgroup'

ⓘ 'Heulandite Subgroup'

ⓘ Offretite

ⓘ 'Phillipsite Subgroup'

ⓘ 'Psilomelane'

ⓘ Ramsdellite

6 valid minerals.

Detailed Mineral List:

ⓘ Calcite

Formula: CaCO₃

References:

Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

ⓘ Celadonite ?

Formula: K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂

Description: Occurs as vesicle fillings. The original references indicate that the so-called celadonite, had a "similar" x-ray pattern without discussion of the implied problem. There was a comment that the chemical composition of the alleged celadonite differed from what would be expected for celadonite, as the species was known at that time. Additional materials are known from the locality which occurs as gnarled acicular clusters. These may or may not be a member of the celadonite-mica group. Another form which may or may not be celadonite occurs as velvety crystal coatings and spherical clusters lining cavities. New mineral studies of the are needed.

References:

Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

ⓘ 'Chabazite'

Description: Occurs as crystals intergrown with calcite.

References:

Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

ⓘ Cryptomelane

Formula: K(Mn⁴⁺₇Mn³⁺)O₁₆

References:

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

ⓘ Erionite-K

Formula: (K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O

References:

azminerals.com

ⓘ 'Erionite Subgroup'

Formula: M₂[Al₄Si₁₄O₃₆] · 15H₂O

References:

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

References:

Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

ⓘ Offretite

Formula: KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.p.164

ⓘ 'Phillipsite Subgroup'

References:

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

ⓘ 'Psilomelane'

References:

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

ⓘ Ramsdellite

Formula: Mn⁴⁺O₂

Description: Occurs as pseudomorphs.

References:

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

Gallery:

CaCO₃ⓘ Calcite

K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂ⓘ Celadonite ?

(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂Oⓘ Erionite-K

(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂Oⓘ 'Heulandite Subgroup'

ⓘ 'Phillipsite Subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Ramsdellite	4.DB.15a	Mn⁴⁺O₂
ⓘ	Cryptomelane	4.DK.05a	K(Mn⁴⁺₇Mn³⁺)O₁₆
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Celadonite ?	9.EC.15	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
ⓘ	Erionite-K	9.GD.20	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
ⓘ	Offretite	9.GD.25	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Unclassified
ⓘ	'Chabazite'	-
ⓘ	'Erionite Subgroup'	-	M₂[Al₄Si₁₄O₃₆] · 15H₂O
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Phillipsite Subgroup'	-
ⓘ	'Psilomelane'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
H	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
H	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Calcite	CaCO₃
O	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
O	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
O	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
O	ⓘ Ramsdellite	Mn⁴⁺O₂
O	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
Na	Sodium
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Na	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
Mg	Magnesium
Mg	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
Mg	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Al	Aluminium
Al	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Al	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
Si	Silicon
Si	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
Si	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Si	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
K	Potassium
K	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂
K	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
K	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Ca	ⓘ Erionite-K	(K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆] · 15H₂O
Mn	Manganese
Mn	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
Mn	ⓘ Ramsdellite	Mn⁴⁺O₂
Fe	Iron
Fe	ⓘ Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂

Other Regions, Features and Areas containing this locality

North America

Sonoran DesertDesert
- San Pedro river valleyValley

North America PlateTectonic Plate

Basin and Range BasinsBasin
Mazatzal DomainDomain

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Bideaux, R.A., et al (1960), Some new occurrences of minerals of Arizona, Arizona Geological Society Digest: 3: 53-56.

Thomssen, Richard W. (1983) The Minerals of Malpais Hill, Pinal County, Arizona. The Mineralogical Record, 14 (2) 109-113

Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.

Quick NavTop Mineral List Other Regions References

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 10, 2024 13:16:38 Page updated: March 23, 2024 18:18:46

Go to top of page