Amethyst
Purple quartz, the February birthstone, famous since ancient Greece as the stone of calm and a clear head.

Crystal Guide · Crystals by purpose
Fluorite, sodalite and clear quartz are popular desk companions for students and busy professionals. In crystal traditions they are associated with focus, clarity and clear thinking.
Keep one on your desk as a cue to put your phone away and concentrate.
Purple quartz, the February birthstone, famous since ancient Greece as the stone of calm and a clear head.
A rare natural blend of amethyst and citrine in one crystal, mined almost entirely in Bolivia.
Vivid blue phosphate mineral – the same mineral family found in our bones and teeth.
Glassy, pyramid-shaped crystals from India's volcanic rocks, prized for their sparkle and meditative feel.
Clear quartz given a shimmering rainbow or metallic coating by bonding vaporised metals to its surface.
Deep 'azure' blue copper mineral once ground into Renaissance paint – a crystal lore stone of insight.
Deep blue azurite and banded green malachite grown together – two copper minerals in one stone.
Surprisingly heavy crystals – from golden blades to 'desert rose' rosettes – a grounding stone in crystal l...
Sapphire-blue triangular crystals found gem-quality in just one place on Earth – California's state gem.
Lacy, glittering lead carbonate crystals with a diamond-like lustre – a toxic but stunning collector's mine...
Brassy-gold copper ore that tarnishes to iridescent blues and purples – the true source of most 'peacock ore'.
Hard golden-green gem famed for its 'cat's eye' variety – parent mineral of alexandrite.
Water-clear rock crystal – the 'master' stone of crystal lore and the heart of modern electronics.
Starbursts of orange or colourless needle crystals from Mexico – a joyful-looking collector's piece.
Clear, glassy crystals named after Danbury, Connecticut – a calm, high-clarity stone in crystal lore.
Rose-shaped clusters of gypsum or baryte crystals that grow in desert sand – nature's stone flowers.
Pure crystallised carbon from deep in the Earth – the hardest natural mineral and April's birthstone.
Denim-blue borosilicate often found in quartz – a crystal lore stone of focus and patience.
Colour-banded crystals that gave 'fluorescence' its name – a crystal lore stone of focus and order.
Heavy silver-grey cubes of lead ore – a striking collector's mineral that should be handled with care.
Colour-changing sodalite that turns violet under UV and fades again in daylight.
The blue-grey form of tiger's eye with a silky moving shimmer – a crystal lore stone of focus and insight.
Metallic iron oxide – the main ore of iron, found even on Mars, and a classic grounding stone.
Brilliantly clear, double-pointed quartz crystals from New York State – not diamonds, but nature's sparkle.
Violet-blue gem that changes shade as you turn it – linked in legend to Viking navigation.
Sparkling purple-red chlorite coloured by chromium – a rare collector's stone.
Deep azure-blue phosphate crystals – a rare, vivid blue collector's stone often confused with lapis lazuli.
Brazilian quartz points with distinctive horizontal 'barcode' ridges – a favourite for meditation.
Pale yellow natural glass from the Sahara, formed about 29 million years ago – carved into Tutankhamun's sc...
Pyrite's paler, spikier twin – and the surprise behind most 'marcasite' jewellery.
Shiny, peelable sheets of mica once used as window glass in Russia – a stone of insight in crystal lore.
Quartz with ghostly inner outlines of earlier crystals – a crystal lore stone of growth and transformation.
Vivid purple phosphate with a satiny metallic sheen – a rare, striking stone.
Clear quartz threaded with golden needles of rutile – nicknamed 'Venus hair' for its shimmering strands.
Deep blue corundum and September's birthstone – a symbol of wisdom and loyalty, worn by royalty for centuries.
Golden to violet gem crystals that can glow yellow under UV – a lesser-known collector's gemstone.
Luminous gypsum named after the moon – a cleansing stone in crystal lore that must be kept away from water.
Soft white quartz clouded by countless tiny bubbles – the gentle, calming form of quartz.
Royal blue stone with white veins, once used to decorate a royal residence – a crystal lore stone of logic ...
The main ore of zinc, with more fire than diamond in its gem form – a grounding stone in crystal lore.
Golden-brown silky quartz with a moving band of light – a classic crystal lore stone of courage and focus.
Wedge-shaped golden-green crystals with more fire than diamond – a rare collector's gem.
Hard, brilliant gem and November birthstone – found in golden, blue, pink and colourless forms.
The 'TV stone' – fibres that carry an image from one side of the stone to the other like optical fibres.
Brilliant red hexagonal crystals from Morocco's Atlas Mountains – a striking collector's specimen.
Radiating green 'starbursts' of needle crystals, famously from Arkansas – a stone of clarity.
One of the oldest minerals on Earth – a fiery December birthstone, not to be confused with cubic zirconia.
Zodiac, chakra and purpose associations come from crystal-lore traditions and vary between authors. Crystals are not a substitute for medical advice.