Black volcanic lapilli, volcanic lava 50/100 mm (n 1 aquarium pebble)

BLACK VOLCANIC LAPILLUS, VOLCANIC LAVA 50/100 mm (n° 1 pebble for aquariums).

The listing refers to the purchase of a single pebble with a diameter between 50 and 100 mm.

Lapilli is an effusive magmatic mineral (vulcanite) naturally calcined at high temperatures, porous, insulating, lightweight .

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-CHEMICAL CHARACTERISTICS

pH: 7 - 8;

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

CHEMICAL ANALYSIS AVERAGE

SiO ₂ : 52.57%;

At ₂ O ₃ : 18.05%;

MnO ₂ : 4.9%;

Fe ₂ O ₃ : 10.38%;

CaO: 10.02%;

Na ₂ O: 0.79%;

TiO ₂ : 1.41%;

MgO: 4.04%;

Cr ₂ O ₃ : 0.01%;

₂ O: 1.66%.

IDEAL FOR

? Rooting growing substrates;

? Draining underlays for sports fields (football, tennis, etc.);

? Draining stabilizer for beaten earth surfaces;

? Mulching;

? Preparation of compost;

? Soilless crops;

? Thermal and acoustic insulation;

? Soil amendment;

? Mineral layer for bio-filtration.

N B: COLOR AND CONTENT 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 grayish-black (when the product is completely dry) to intense black (when the product is humid or wet). 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. Observing listings with different grain sizes from this one, it is possible to appreciate the color variations that are mainly given by the degree of humidity of the material at the time the photograph was taken.

It should also be noted that, given the particular origin of the product, it may contain small traces of moss and plant roots.