Luserna stone

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Manavella is associated with the “Pietra di Luserna Cultivation Consortium of Bagnolo Piemonte”.

The purpose of the consortium is to guarantee the customer the highest quality of the product.

The consortium brand is at the same time synonymous with modernity in the creations.

Luserna stone data sheet

Characteristics of the Luserna stone

Chemical composition (% by weight):

SiO2: 72.5 - 75.8

TiO2: 0.1 - 0.3

AlO3: 12.7 - 14.1

Fe2O3 0.4: - 1.1

FeO: 0.7 - 1.8

MhO: 0.1 - 0.9

CaO 0.2 - 1.0

Na2: 2.9 - 5.4

K2O: 2.2 - 4.7

P2O5: 0.1 - 0.2

pc * 0.5 - 1.6

* pc = loss due to calcination

Physical-mechanical characteristics:

Mass apparent volume: 2620 - 2660 Kg./Mc.

Coefficient of ambition: 2.99 - 3.00%

Simple compression breaking load of specimens in the natural state:

Mass apparent volume: 2620 - 2660 Kg./Mc.

Coefficient of ambition: 2.99 - 3.00%

Simple compression breaking load of specimens subjected to freezing cycles:

With load direction perpendicular to the schistosity: 136 - 195 MPa

With load direction parallel to the schistosity: 84 - 113 MPa

Tangent elastic modulus: 60360 - 67330 MPa

Secant elastic modulus: 44650 - 48290 MPa

Live tensile strength through bending: 19.1 - 23.7 MPa

Wear due to sliding friction:

Abrasion coefficient on the tribometer: 2.40 - 2.42 MPa Coefficient of abrasion referred to S. Fidelino granite: 0.90

Impact break test:

Minimum height of fall: Cm 70 - 90 Coefficient of linear thermal expansion: 0.0033 mm / m ° C * 1 MPa = 10.2 Kg./cmq

Lamellar gneiss

Lamellar gneiss is a type of metamorphic rock similar to granite but rich in quartz and feldspar and poor in iron-magnesium silicates. It forms at great depth in the areas where the collisions between plates took place, therefore in correspondence with the mountain ranges that were formed following these movements of the earth's crust.

It is called lamellar because it is divided into layers placed one above the other like sheets. Luserna stone is a type of lamellar gneiss that is extracted in Piedmont in the quarries of Val Pellice and Valle Po.