Crystals for Gemini

The best crystals for Gemini are Amber, Ametrine and Angelite, the first of 26 stones tradition ties to the sign. Each entry names the mineral it actually is, the physical test that separates a real one from a treated lookalike, and what the stone means for a Gemini chart.

• Amber2-2.5 Mohs · organic · solar-plexus, sacralTree resin from Eocene forests, polymerised over 30 to 90 million years, and the only gem material that regularly contains a dead animal. T…
• Ametrine7 Mohs · quartz · solar-plexus, third-eye, crownA single quartz crystal that grew through a temperature gradient, ending up amethyst at one end and citrine at the other, with a boundary y…
• Angelite3.5 Mohs · sulfate · throat, third-eye, crownAnhydrite, calcium sulfate with the water taken out, in a soft periwinkle from Peru, given a marketing name in the 1980s and now permanentl…
• Aquamarine7.5-8 Mohs · silicate · throat, heartBlue beryl, the same species as emerald with iron instead of chromium, and the traditional talisman of sailors, the Romans considered it Ne…
• Aura Quartz7 Mohs · quartz · crown, third-eye, throatOrdinary quartz run through a vacuum chamber and fused with vaporised metal, a 1980s lapidary trick that produced the most photogenic objec…
• Bismuth2-2.5 Mohs · man-made · crown, third-eyeElemental bismuth, grown in a saucepan and cooled slowly enough that the edges outrun the faces and produce those stepped rainbow labyrinth…
• Blue Apatite5 Mohs · phosphate · throat, third-eyeThe mineral your teeth and bones are made of, and the Mohs scale's definition of hardness 5. Its name comes from the Greek for 'to deceive'…
• Blue Lace Agate6.5-7 Mohs · chalcedony · throatChalcedony banded in pale blue and white, essentially all of it from one region of Namibia, which is why the supply is finite and the price…
• Botswana Agate6.5-7 Mohs · chalcedony · crown, sacralGrey and dusty-pink banded agate from the Bobonong district, famous for band-per-millimetre fineness that makes cut slabs look like topogra…
• Celestite3-3.5 Mohs · sulfate · throat, third-eye, crownStrontium sulfate, the mineral that makes fireworks red, growing as pale blue crystal-lined cavities in Madagascan and Ohioan sedimentary r…
• Chrysocolla2.5-7 Mohs · silicate · throat, heartA hydrated copper silicate with no fixed hardness, ranging from chalk to gem depending on how much silica got into it. The Greeks named it …
• Citrine (Natural)7 Mohs · quartz · solar-plexus, sacralActual citrine is a quiet, weak-tea yellow and it is genuinely uncommon, most of what the trade calls citrine has been in an oven. The natu…
• Crazy Lace Agate6.5-7 Mohs · chalcedony · solar-plexus, sacralChihuahuan agate that formed in a rock that kept breaking and re-healing, producing banding with no discipline whatsoever. Dealers call it …
• Dalmatian Stone6-7 Mohs · rock (aggregate) · root, sacralNot a jasper and not tourmaline-spotted: a peralkaline microgranite from Chihuahua whose black flecks are arfvedsonite, an amphibole. The e…
• Emerald7.5-8 Mohs · silicate · heartBeryl coloured by chromium, and one of the four traditional precious stones, mined at Cleopatra's Egyptian workings, then in vast quantity …
• Fluorite4 Mohs · halide · third-eye, throat, heartCalcium fluoride in cubes and octahedra, coloured every shade in the box by lattice defects and trace elements, and the mineral that gave f…
• Herkimer Diamond7 Mohs · quartz · third-eye, crownNot diamonds, exceptionally clear double-terminated quartz that grew free-floating in 500-million-year-old dolostone pockets in upstate New…
• Howlite3.5 Mohs · silicate · crown, third-eyeA calcium borosilicate from Nova Scotia that would be an obscure collector's mineral if it were not the perfect blank canvas, porous, white…
• Jadeite Jade6-7 Mohs · silicate · heartThe other jade, a sodium aluminium pyroxene, rarer than nephrite and the material of the Qing imperial court and Mesoamerican Olmec and May…
• Moonstone6-6.5 Mohs · feldspar · sacral, third-eye, crownPotassium feldspar that unmixed into microscopically thin alternating layers as it cooled, scattering light into a floating blue-white glow…
• Optical Calcite3 Mohs · carbonate · crown, third-eyeClear calcite that splits light into two rays, so text read through it appears twice, the mineral that let nineteenth-century physicists pr…
• Rutilated Quartz7 Mohs · quartz · solar-plexus, crownQuartz that trapped needles of titanium dioxide as it grew, producing what looks like gold wire frozen mid-flight. Renaissance Europeans ca…
• Serpentine2.5-6 Mohs · silicate · heart, rootThe rock that forms when seawater cooks peridotite deep in the crust, California's state rock, the world's asbestos problem, and the crysta…
• Tanzanite6-7 Mohs · silicate · third-eye, crown, throatFound in 1967 in a strip of ground about seven kilometres long in the Merelani Hills of Tanzania, and nowhere else on earth. Tiffany rename…
• Tiger's Eye6.5-7 Mohs · quartz · solar-plexus, rootBlue asbestos fibres replaced molecule by molecule with silica, keeping the fibrous alignment and gaining a hard glassy body, the sheen is …
• Watermelon Tourmaline7-7.5 Mohs · silicate · heartA single elbaite crystal that changed its chemistry mid-growth, ending up pink inside and green outside, slice it and you get the fruit. Br…

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