Black volcanic lapilli, volcanic lava 10/20 mm (1 kg)

BLACK VOLCANIC LAPILLUS, VOLCANIC LAVA 10/20 mm (1 Kg) .

Essentially it is 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 degree.

In fact, during the solidification phase, the vapors present in the magma, suddenly released, caused the entire mass of the magma to swell, and it is during this rapid cooling phase that the differences in the physical structure of the various volcanic aggregates arose: the volcanic lapilli was formed 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 significantly smaller number.

PHYSICAL-CHEMICAL CHARACTERISTICS

ACTIVE LIMESTONE: free;

pH: 7 - 8;

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

AVERAGE CHEMICAL ANALYSIS

SiO ₂ : 51%;

At ₂ O ₃ : 18%;

₂ O: 3.2%;

Fe ₂ O ₃ : 11%;

CaO: 8.6%;

Na ₂ O: 3.9%;

MgO: 4.0%.

LIGHT ORNAMENTAL ROCK IDEAL FOR

? Mulching;

? Aquariums;

? Rock gardens;

? Street furniture.

N.B .: COLOR NEWS

Please note that the color of the material varies. It depends on many factors, including the quarry's extraction location and the humidity level. The color ranges from grayish-black (when the product is completely dry) to deep black (when the product is damp or wet). Small reddish or grayish-brown clumps may also be present (in these cases, we are talking about very few granules in the total volume). It is not possible to choose between these colors, which are found indiscriminately within the product. The secondary photograph in 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 listing) labelled and packaged, in accordance with the law, by Geosism & Nature sas staff.