South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA i
Regional Level Types
South railway cut - not defined -
Malpais Hill Hill
Dudleyville Census-designated Place
Pinal County County
Arizona State
USA Country

Regional Level Types
South railway cut	- not defined -
Malpais Hill	Hill
Dudleyville	Census-designated Place
Pinal County	County
Arizona	State
USA	Country

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Thommsen (1983) Mineralogical Record Map

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Calcite, etc.

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Thommsen (1983) Mineralogical Record Map

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Calcite, etc.

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Thommsen (1983) Mineralogical Record Map

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Calcite, etc.

South railway cut, Malpais Hill, Dudleyville, Pinal County, Arizona, USA

Latitude & Longitude (WGS84):

32° 54' 21'' North , 110° 43' 55'' West

Latitude & Longitude (decimal):

G#: 9tc70nr6q

Köppen climate type:

BSk : Cold semi-arid (steppe) climate

Nearest Settlements:

Place	Population	Distance
Dudleyville	959 (2011)	8.4km
Winkelman	346 (2017)	9.8km
Hayden	650 (2017)	12.1km
Mammoth	1,487 (2017)	22.1km
Kearny	2,038 (2017)	23.7km

Mindat Locality ID:

255149

Long-form identifier:

mindat:1:2:255149:7

GUID (UUID V4):

This is the original locality mentioned prominently in Thomssen (1983).

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

ⓘ '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.

ⓘ Celadonite ?

Formula: K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂

Description: 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" 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 defined at that time. Additional apparently unstudied materials are known from the locality. One interesting material occurs as gnarled acicular greenich 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.

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.

ⓘ 'Chabazite'

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.

ⓘ Cryptomelane

Formula: K(Mn⁴⁺₇Mn³⁺)O₁₆

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.

ⓘ Erionite-K

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

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.

ⓘ 'Erionite Subgroup'

Formula: M₂[Al₄Si₁₄O₃₆] · 15H₂O

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.

ⓘ '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.

ⓘ Offretite

Formula: KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O

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.

ⓘ 'Phillipsite Subgroup'

Formula: (Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O

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.

ⓘ 'Psilomelane'

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.

ⓘ Ramsdellite

Formula: Mn⁴⁺O₂

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.

Gallery:

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'	-	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
ⓘ	'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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
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
Ba	Barium
Ba	ⓘ Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O

Other Regions, Features and Areas containing this locality

North AmericaContinent

Sonoran DesertDesert
- San Pedro river valleyValley

North America PlateTectonic Plate

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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.