Технические руководства · 2 мин чтения

Granite: Types, Colours and Uses – Practical Guide for Architects

Granite – a durable, versatile stone that has adorned buildings and interiors for centuries. This guide explains its igneous origins, colour palette driven by mineral composition, common finishes, and practical uses from kitchen worktops to monumental facades. We also outline typical price bands, notable varieties, and key considerations for architects, designers, contractors and buyers. All measurements are metric and the information reflects typical ranges rather than specific quarry data.

Igneous Petrography in Simple Terms

Granite forms from the slow cooling of magma beneath the Earth's surface, allowing large crystals to grow. The primary minerals are quartz, feldspar and mica. Quartz gives hardness and resistance to abrasion; feldspar contributes to colour and texture; mica adds a subtle sheen. The proportion of these minerals determines the stone’s appearance and mechanical properties. In a typical granite, quartz ranges from 20–40 %, feldspar 30–50 %, and mica 10–20 %. The remaining volume is filled with minor minerals and pores that influence porosity and staining behaviour.

Colour Palette – Mineral‑Driven Hues

The dominant mineral dictates the stone’s colour:

- Black Gabbro‑type granites contain high iron‑rich plagioclase, giving a deep, almost obsidian tone.

- Pink Feldspar varieties feature abundant orthoclase, producing warm, rosy shades.

- Blue Sodalite/Labradorite granites showcase feldspathic minerals with trace titanium, yielding a subtle sky‑blue or iridescent effect. These hues are often accentuated by fine specks of mica or quartz, creating a speckled or veined appearance.

Finishes – From Matte to Polished

Granite can be finished in several ways:

- Matte (unpolished) retains a natural, tactile feel and hides scratches.

- Honed gives a satin sheen, ideal for high‑traffic areas.

- Polished offers a mirror‑like surface, enhancing colour depth but requiring more maintenance.

- Brushed or satin can be applied to specific zones to reduce glare. The choice of finish should align with the intended use and maintenance expectations.

Applications – Kitchens, Exteriors and Monuments

Granite’s strength and aesthetic versatility make it suitable for:

- Kitchen worktops: polished or honed surfaces resist heat, scratches and stains.

- Exterior cladding: black or pink granites provide a striking façade, while blue varieties add subtle contrast.

- Monuments and memorials: the stone’s weather resistance and timeless look make it a preferred choice for statues, plaques and memorial walls.

Price Bands – Typical Ranges

Granite prices vary by colour, grain, finish and source. Typical ranges (per square metre) are:

- Standard black or pink granites: 120–200 €.

- Premium blue or rare veined varieties: 250–400 €.

- Custom finishes or large slabs may add 20–30 % to the base price. These figures are indicative and can fluctuate with market conditions.

Famous Varieties – A Quick Overview

Some renowned granite types include:

- Carrara Black: deep black with subtle specks, used in high‑end kitchens.

- Pink Carrara: warm pink with fine quartz grains, popular for interior walls.

- Blue Labradorite: rare blue‑green veining, prized for decorative panels.

- Gabbro‑type: dense, dark, ideal for structural facades.

Glossary

A – Abrasion Resistance – the stone’s ability to withstand wear.

B – Bulk Density – mass per unit volume, influencing weight and handling.

C – Colour Variation – natural differences in hue across a slab.

D – Durability – long‑term resistance to weathering and chemical attack.

E – Edge Profile – the shape of the slab’s perimeter, e.g. beveled, chamfered.

FAQ

Q1: How long does granite last in a kitchen?

A1: With proper sealing and maintenance, granite can last 20–30 years or more.

Q2: Is granite suitable for outdoor use?

A2: Yes, especially black or pink varieties with low porosity; they resist frost and UV.

Q3: Can I polish a granite slab after installation?

A3: Polishing is best done before installation; post‑installation polishing can damage the surface.

Q4: What is the best sealant for granite?

A4: A penetrating, water‑repellent sealant applied annually is recommended for most granites.