Black volcanic lapilli, volcanic lava 3/5 mm (1 kg)

BLACK VOLCANIC LAPILLUS, VOLCANIC LAVA 3/5 mm (1 Kg - 1.1 lt) .

It is essentially an effusive magmatic mineral (vulsine vulcanite from the Pleistocene period) naturally calcined at high temperatures, porous, insulating, light .

Pumice and lapilli are the product of explosive volcanic eruptions formed following a violent expansion of gases dissolved in lavas of acidic chemical composition: the rapid cooling of the rock prevented its crystallization, trapping the gases inside and generating alveolar minerals that expanded to a more or less accentuated extent.

In fact, during the solidification phase, the vapours present in the magma, suddenly released, caused the swelling of the entire mass of the magma and it is during this rapid cooling phase that the differences in the physical structure of the various volcanic aggregates were determined: the volcanic lapilli was formed starting from a magma with a lower silica content.

The lower viscosity and slower cooling of the lava facilitated the escape of a certain quantity of the gases present in the magma.

Minerals were formed that were characterized by voids of a larger average diameter than those of pumice but in a decidedly smaller number.

PHYSICAL AND CHEMICAL CHARACTERISTICS

ACTIVE LIMESTONE: free;

pH: 7 - 8;

NON-TOXIC PRODUCT: (free from Free Crystalline Silica) .

CHEMICAL ANALYSIS AVERAGE

SiO ₂ : 51%;

At ₂ O ₃ : 18%;

_K2O : 3.2%;

Fe ₂ O ₃ : 11%;

CaO: 8.6%;

Na ₂ O: 3.9%;

MgO: 4.0%.

LIGHT ORNAMENTAL ROCK IDEAL FOR

? Mulching;

? Aquaristics;

? Rock gardens;

? Street furniture.

N B: COLOR NEWS

Please note that the color of the material is variable. It depends on many factors including: the extraction point in the quarry and the humidity contained. The color varies from black-grayish (when the product is completely dry) to intense black (when the product is humid or wet). There may also be small reddish or brown-grayish clumps (in this case we are talking about very few granules in the total volume). It is not possible, in any way, to choose between these colors that are found indiscriminately within the product. The secondary photograph of this listing, where the product is held in the hand, demonstrates the variability of the shades.

NB: PACKAGING INFORMATION

Please note that the product will arrive inside a bag (with a total weight of 1 kg, as specified in the title of the advertisement) labelled and packaged, according to the terms of the law, by Geosism & Nature sas employees.