Ver­mi­culite is a nat­ur­al min­er­al belong­ing to the hydromi­ca group. It is known for its unique phys­i­cal and chem­i­cal prop­er­ties, which make it indis­pens­able in many indus­tries, agri­cul­ture and con­struc­tion. The name of the min­er­al comes from the Latin word ver­micu­lus, mean­ing ‘worm,’ due to ver­mi­culite’s char­ac­ter­is­tic abil­i­ty to expand under the influ­ence of high tem­per­a­tures and take on a shape sim­i­lar to small worms.

Ver­mi­culite is includ­ed in the list of min­er­als of nation­al impor­tance approved by Res­o­lu­tion of the Cab­i­net of Min­is­ters of Ukraine No. 827 of 12 Decem­ber 1994 as an adsor­bent raw mate­r­i­al.

Composition and properties

Ver­mi­culite is an alu­mi­nosil­i­cate of mag­ne­sium, iron and alu­mini­um with a unique lay­ered struc­ture. Ver­mi­culite con­tains a sig­nif­i­cant amount of mag­ne­sium (10–14%) in the form of mag­ne­sium alu­mi­nosil­i­cates, 3–5% potas­si­um, 1.2–2% cal­ci­um and trace ele­ments: chromi­um, nick­el, man­ganese, cobalt, cop­per, molyb­de­num.
Chem­i­cal for­mu­la Mg₀.₇(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ * 8H₂O

Ver­mi­culite has a mon­o­clin­ic crys­tal struc­ture. It has per­fect cleav­age. Its den­si­ty is 2.4–2.7. Hard­ness on the Mohs scale of min­er­al hard­ness — 1–1.5. Colour is brown, yel­low­ish-brown, gold­en-yel­low, some­times with a green­ish tint. Lus­tre is pearly or greasy. It has a high cation exchange capac­i­ty.

The most impor­tant prop­er­ty of ver­mi­culite is its abil­i­ty to expand when heat­ed to a tem­per­a­ture of 900‑1000°C, increas­ing in vol­ume by 15–20 times, which leads to an expan­sion of the adsorp­tion sur­face. Due to its spe­cif­ic poros­i­ty, adsorp­tion and ion exchange prop­er­ties, expand­ed ver­mi­culite is capa­ble of selec­tive­ly absorb­ing cer­tain sub­stances and cations, espe­cial­ly potas­si­um and ammo­ni­um, which it then slow­ly releas­es to plants, act­ing as a pro­longed macro- and micro­fer­tilis­er. The process of fix­ing ammo­ni­um, mobile forms of nitro­gen, mag­ne­sium, phos­pho­rus and potas­si­um in the soil with ver­mi­culite is wide­ly stud­ied by sci­en­tists in many for­eign coun­tries.

• Ther­mal insu­la­tion: Ver­mi­culite has low ther­mal con­duc­tiv­i­ty, mak­ing it ide­al for use in ther­mal insu­la­tion mate­ri­als.
• Fire resis­tance: The min­er­al can with­stand tem­per­a­tures up to 1000 °C with­out releas­ing tox­ic sub­stances.
• Chem­i­cal neu­tral­i­ty: The min­er­al is resis­tant to acids and alka­lis.
• Envi­ron­men­tal friend­li­ness: It is a nat­ur­al mate­r­i­al that does not harm the envi­ron­ment.

Distribution in Ukraine

In Ukraine, ver­mi­culite is found in the regions of Volyn, Kirovohrad and Zapor­izhzhia regions.

There are more than 50 known ver­mi­culite deposits in Ukraine, most of which are con­cen­trat­ed with­in the Ukrain­ian Shield. The Kami­anomo­hyl­sk deposit was found in the Azov block, and 14 promis­ing areas with P1 and P2 resources totalling 32.8 mil­lion tonnes were dis­cov­ered in the cen­tral part of the Ukrain­ian Shield. These deposits are asso­ci­at­ed with the weath­ered crusts of gab­broids and gneiss­es. The Slav­gorod, Lipovenkovsky and Kolarovsky occur­rences were also dis­cov­ered in the Volyn block, but they are not of indus­tri­al sig­nif­i­cance.

The Kami­anomo­hyl­skyi occur­rence is rep­re­sent­ed by weath­er­ing crust on metab­a­sites and biotite gneiss­es of the Man­gus com­plex. The occur­rence is locat­ed near the vil­lage of Nazariv­ka in the Volo­darsky dis­trict of the Donet­sk region with­in the Kamyani Mohy­ly reserve. The pro­duc­tive hori­zon has an aver­age thick­ness of 10.3 m, with a hydro­bi­otite and ver­mi­culite con­tent of 16.01%. The total ver­mi­culite resources of this deposit are esti­mat­ed at 1,860 thou­sand tonnes. The Andri­ivskyi deposit is formed by weath­er­ing crust on ultra­ba­sic rocks, biotite and amphi­bole-biotite gneiss­es. The thick­ness of the ore hori­zon reach­es 14.1 m, the aver­age con­tent of ver­mi­culite in the rock is 25%, and hydro­bi­otite is 31.8%. The total resources of hydromi­ca amount to 848 thou­sand tonnes.

The Rodi­on­ivsky deposit is locat­ed on the right bank of the Berdyan­sk Reser­voir between the vil­lages of Osipenko and Rodi­on­iv­ka in the Berdyan­sk Dis­trict of Zapor­izhzhia Region. It is char­ac­terised by weath­er­ing crust on biotite, gar­net-biotite, sil­i­man­ite-biotite and mus­covite-biotite schists with amphi­bo­lite lens­es. The thick­ness of the ore hori­zon is 12 m, with a roof thick­ness of 10.1 m. The con­tent of hydro­bi­otite in the ore is 22.4%, ver­mi­culite — up to 1%. The ore also con­tains quartz, pla­gio­clase, mus­covite, chlo­rite, gar­net and horn­blende.

The Slav­gorod occur­rence is locat­ed near the town of Slav­gorod in the Simel­niko­vo dis­trict of Dnipropetro­vsk region, in hyper­b­a­sites of the Aul series, where they come into con­tact with gneiss­es. This zone extends for 1 km in length and up to 200 m in width, and the thick­ness of ver­mi­culite-bear­ing lay­ers is 10–30 m. The con­tent of ver­mi­culite and hydro­bi­otite reach­es 25%, and the esti­mat­ed reserves are esti­mat­ed at 700 thou­sand tonnes. The Lipovenkovsky deposit is rep­re­sent­ed by five vein-like bod­ies in the hyper­b­a­site mas­sif. The length of these bod­ies is 70–160 m, the thick­ness is 3–8.5 m, and the hydromi­ca con­tent ranges from 40–80%. The esti­mat­ed reserves of ver­mi­culite are 190 thou­sand tonnes, and those of hydro­bi­otite are 97 thou­sand tonnes.

Lypovenky deposit, locat­ed near the vil­lage of Lypovenky in the Golo­vanivskyi dis­trict of the Kirovohrad region. The pro­duc­tive part of the deposit is the weath­ered crust of ser­pen­tinites, ser­pen­tinised peri­dotites, as well as tremo­lites and acti­no­lites, which are asso­ci­at­ed with 5 ver­mi­culite-bear­ing vein-like bod­ies with a length of 60–170 m and a thick­ness of 3–8.5 m. The esti­mat­ed reserves of ver­mi­culite at the deposit are 190 thou­sand tonnes, and those of hydro­bi­otite are 97 thou­sand tonnes.

The Kolar­ivsky deposit con­tains ver­mi­culite-bear­ing weath­er­ing crust on lam­proites, with an aver­age pro­duc­tive lay­er thick­ness of 19.3 m. The ver­mi­culite con­tent is 22.5%, and the esti­mat­ed reserves of this deposit are esti­mat­ed at 700 thou­sand tonnes.

In addi­tion, in the south-west­ern part of the Ukrain­ian Shield, in par­tic­u­lar in the Raig­orod­skaya, Yurkovskaya and Dzhurin­skaya areas, geo­log­i­cal explo­ration work was car­ried out with the aim of increas­ing the min­er­al resource base of ver­mi­culite. Explo­ration work was also car­ried out in the Zakarpat­tia and Donet­sk regions, which also have prospects for the dis­cov­ery of deposits of this raw mate­r­i­al.

Uses of vermiculite

Ver­mi­culite has a wide range of appli­ca­tions due to its unique prop­er­ties. It is used as a light­weight filler for con­crete, a raw mate­r­i­al for the man­u­fac­ture of refrac­to­ry mate­ri­als, heat and sound insu­la­tion ele­ments, as well as for fire-resis­tant plas­ters and ther­mal insu­la­tion of met­al­lur­gi­cal fur­naces. In addi­tion, ver­mi­culite is used in the pro­duc­tion of anti-fric­tion mate­ri­als, plas­tics, pes­ti­cides, rub­ber prod­ucts, and paints. In agri­cul­ture, this min­er­al is used to improve soil struc­ture. It is also used in the dis­pos­al of radioac­tive waste, waste­water treat­ment, as well as in space tech­nol­o­gy, the aero­space indus­try, and trans­port con­struc­tion.

One of the key prop­er­ties of this min­er­al is ther­mal insu­la­tion. Due to its low ther­mal con­duc­tiv­i­ty, ver­mi­culite is used in the man­u­fac­ture of ther­mal insu­la­tion mate­ri­als. It is also high­ly fire-resis­tant, with­stand­ing tem­per­a­tures of up to a thou­sand degrees with­out releas­ing tox­ic sub­stances.

Its chem­i­cal neu­tral­i­ty and abil­i­ty to retain mois­ture make it pop­u­lar in agri­cul­ture. For exam­ple, in plant cul­ti­va­tion, it is added to soils or sub­strates to retain mois­ture and min­er­als, which pro­motes healthy crop growth. Act­ing as a mag­ne­sium fer­tilis­er, ver­mi­culite releas­es the ele­ment need­ed by plants and grad­u­al­ly releas­es it, which is of great prac­ti­cal impor­tance, espe­cial­ly for areas where sod-pod­zolic sandy and sandy loam soils pre­vail, which are defi­cient in mag­ne­sium.

Ver­mi­culite is also wide­ly used in con­struc­tion. It is used as insu­la­tion in build­ing struc­tures and added to con­crete mix­tures to reduce their weight and improve their ther­mal insu­la­tion prop­er­ties. Due to its fire resis­tance, it is indis­pens­able in the man­u­fac­ture of pro­tec­tive coat­ings for met­al struc­tures, as well as in the con­struc­tion of fire­places and chim­neys.

In addi­tion, ver­mi­culite is in demand in indus­try as an absorbent, fil­ter mate­r­i­al and com­po­nent for refrac­to­ry prod­ucts. It is light­weight, durable, envi­ron­men­tal­ly friend­ly and suit­able for reuse, mak­ing it the opti­mal choice for many needs.

In sum­ma­ry, ver­mi­culite com­bines envi­ron­men­tal friend­li­ness, ver­sa­til­i­ty, and ease of use, ensur­ing its pop­u­lar­i­ty in var­i­ous indus­tries. If you need a reli­able mate­r­i­al for spe­cif­ic tasks, ver­mi­culite is an excel­lent choice.