The Val Pola landslide is a huge rock avalanche happened on July 28, 1987, after the exceptionally high rainfall occured in Valtellina during June and July 1987. The Val Pola creek significantly eroded its valley flanks, including the area of debris accumulation of post-glacial landslides. This resulted in a fracture which detached an estimated volume of 35–45 million cubic metres of old debris from the northern slope of the Monte Zandila (southeastern ridge of Pizzo Coppetto). The fracture eventually produced a rapid rock avalanche with subsequent shallow landslides of the Val Pola sides and a debris flow along the Val Pola thalweg. The flow entrained an estimated 5–8 million cubic meters of debris. The created alluvial fan dammed the Adda River and created a lake. The mass ran about 1.5 km downstream and generated an upstream mud wave 35 m high which traveled about 2.7 km. The settlements ofSant'Antonio Morignone, Morignone, and Aquilone were obliterated, and twenty-two people were killed by the main landslide.

Zeolites, prehnite and quartz have been found in narrow fissures in gneiss blocks (Romani & Mottana, 1997; Bedognè et al., 2006).

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Mineral List

ⓘ 'Heulandite Subgroup'

ⓘ Prehnite

ⓘ Quartz

ⓘ Scolecite ?

ⓘ 'Stilbite Subgroup'

3 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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ⓘ Gneiss

Detailed Mineral List:

ⓘ 'Heulandite Subgroup'

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

References:

Romani, E., and Mottana, A. (1997) I dopo Pola 1987-1997. Minerali e rocce dell'Alta Valtellina nella raccolta del Museo Mineralogico e Naturalistico di Bormio. Tipografia Compagnoni, Valdidentro, 115 pp.

Bedognè, F., Montrasio, A., and Sciesa, E. (2006) I minerali della media-alta Valtellina, delle Orobie valtellinesi e della Val Poschiavo. Aggiornamenti sulle altre località della provincia di Sondrio. Bettini, Sondrio, 255 pp.

ⓘ Prehnite

Formula:Ca₂Al₂Si₃O₁₀(OH)₂

References:

ⓘ Quartz

Formula:SiO₂

References:

ⓘ Scolecite ?

Formula:CaAl₂Si₃O₁₀ · 3H₂O

Description: The acicular mineral reported as natrolite by Romani & Mottana (1997) is probably scolecite (Bedognè et al., 2006).

References:

ⓘ 'Stilbite Subgroup'

Formula:M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 9 - Silicates
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Scolecite ?	9.GA.05	CaAl₂Si₃O₁₀ · 3H₂O
Unclassified
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Scolecite	CaAl₂Si₃O₁₀ · 3H₂O
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	Oxygen
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Scolecite	CaAl₂Si₃O₁₀ · 3H₂O
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Na	Sodium
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	Aluminium
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Scolecite	CaAl₂Si₃O₁₀ · 3H₂O
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	Silicon
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Scolecite	CaAl₂Si₃O₁₀ · 3H₂O
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
K	Potassium
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	Calcium
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Scolecite	CaAl₂Si₃O₁₀ · 3H₂O

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

AlpsAccretionary Complex

EuropeContinent

The AlpsMountain Range

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Val Pola landslide, Valdisotto, Sondrio Province, Lombardy, ItalyiRegional Level TypesVal Pola landslideLandslide ValdisottoMunicipality Sondrio ProvinceProvince LombardyRegion ItalyCountry

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

Val Pola landslide, Valdisotto, Sondrio Province, Lombardy, Italy i
Regional Level Types
Val Pola landslide Landslide
Valdisotto Municipality
Sondrio Province Province
Lombardy Region
Italy Country