Sodalite in Depth
The blue that is not lapis
Sodalite is a sodium aluminum silicate with chlorine in the structure, part of the feldspathoid group, which means it grows in silica-poor igneous rocks where ordinary feldspar cannot. The color is a deep royal blue, usually broken by white veins and patches of calcite or nepheline that give it a marbled look rather than the even ground of lapis.
The quick way to tell it from lapis lazuli is pyrite. Lapis has gold flecks; sodalite does not. Sodalite is also a slightly more purple-toned blue and shows a white streak when scraped on unglazed porcelain. Bancroft in Ontario is the classic locality, and Brazil, Namibia, and Greenland supply the market. Hackmanite is a sodalite variety that changes color under ultraviolet light and fades back in the dark, which is a genuinely odd property called tenebrescence.
Working with it
Sodalite's tradition is about thinking clearly and saying what you actually mean, which makes it a common desk and study stone alongside fluorite. Where fluorite gets used for organizing, sodalite gets used for the moment before speaking: settling nerves, sorting out what you believe from what you were told.
Practical placements are a palm stone at a desk, a small tumble in a bag before a meeting or a class, or a piece near where you write. In layouts it goes at the throat and the brow. People who find lapis too intense often prefer sodalite, and it has the advantage of being cheap enough to buy in a size that actually fills a hand.
Care
Sodalite is 5.5 to 6 on Mohs, softer than quartz, so it scratches from ordinary handling and dust. Store it apart from quartz, agate, and anything harder. Polished surfaces scuff and are not easy to restore at home.
Brief rinsing is acceptable but do not soak it, because the calcite content and any micro-porosity will take up water and dull the surface. Skip salt entirely, since it is both abrasive and chemically unhelpful here. Avoid acids and household cleaners. Sunlight is fine for short periods, though prolonged exposure is best avoided as a general precaution with any deeply colored stone.
Signs, chakras, companions
Sagittarius is the standard pairing, with Virgo and Aquarius also cited, and the chakra links are throat and third eye. That combination is why it turns up in almost every recommendation about communication and self-honesty.
It pairs with amazonite when the goal is speaking without heat, and with clear quartz when you want the effect sharpened. Fluorite is the natural companion for study arrangements. Lapis lazuli and sodalite together are somewhat redundant, so if budget is a factor, buy the sodalite big and the lapis small.