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Verde Maritaca

Description of colouring and granulometry: relatively uniform granite of a greenish-grey to dark olive grey colour with
greenish-grey streaks and shading. This rock is originally made up of a lightcoloured stone which, during the chemical
transformations of its composition (metasomatism), turns a deep green colour. The hornblende and pyroxene are also
transformed into dark green chlorite, resulting in the original granular structure being lost. From a mineralogical point of
view, this stone is made up of feldspar, orthoclase and plagioclase (coloured green by small quantities of chlorite),
ransparent grey quartz, green chlorite and very small amounts of biotite and magnetite. It is quarried near the little town of
Minas Gerais.

Prevailing applications: interior and exterior. Wall cladding, flooring, slab works.

Availability: medium.

Finitions-textures: smooth, polish, flamed, impact.

Physical and mechanical properties: volumetric weight: 2670-2671 kg/m3; absorption coefficient: 0.13%; apparent
porosity: 0.4-2.0%; compression breaking load: 2183kg/cm2; bending strength: 139 kg/cm2; coefficient of thermal
expansion: 0.5-0.8 mm/mx100°C; shock resistance: 60 cm; wear from abrasion according to Boehme: 4-10 cm3/50cm2;
Mohs hardness: >5.

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Description from
TRE
Collection: materials, manufacturing and uses
ANNUAL STONE
by
Beatrice Zoppas