Howlite | Rock Encyclopedia

Encyclopedia

234 rocks, minerals, gems and fossils, each with its photographs, how to tell it apart, and what it has meant to people.

Often openedAmethyst Obsidian Rose quartz Turquoise Moonstone Opal

234 specimens6 groups15 meanings

Stone of the dayLapis lazuliSpiritLapis lazuli is a blue metamorphic rock used as a gem material, not a single blue mineral. Its striking colour may be broken by white calcite and small golden pyrite flecks. The mix is visually distinctive, but a uniformly blue photo alone cannot verify material, treatment or origin.Read about itJames St. John · CC BY 2.0

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The stones that lists and traditions have attached to a month or a year of marriage.

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Twelve months, each with its stones.

January10 stones

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The stones named for each year of marriage.

2nd anniversary10 stones

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What people have asked stones to stand for

Each word gathers the stones whose folklore records it; the stories are in the articles.

The collection

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GroundingCalmPetrified woodPatrykTBrown · CC0

Photo: Ra'ike (see also: de:Benutzer:Ra'ike) · CC BY 3.0

Calcium borosilicate mineral

In folklore

Howlite often looks like white porcelain marked with wandering grey lines. This inexpensive mineral is carved into beads and small figures, and it readily takes blue dye. That makes it especially important to recognise when a bright blue “turquoise” bracelet or gift has no clear material disclosure.1 2

At a glance

Composition: Ca₂B₅SiO₉(OH)₅
Colour: White or colourless, sometimes brown; dark veining in massive material
Luster: Subvitreous in crystals; dull to porcelain-like in masses
Hardness: 3.5–6.5Mohs6.5 for crystals; massive material separates near 3.5
Crystal system: Monoclinic
Transparency: Transparent in rare crystals; usually opaque in masses
Streak: White

Most shop pieces are opaque white or cream with irregular grey, charcoal or brown veining. Polished beads have a smooth, chalky or porcelain-like surface rather than the glassy depth of a transparent gem. The lines may form open, branching networks. The pattern can resemble turquoise's matrix, which is why dyed howlite is common in that colour. Rare individual crystals look different from the familiar nodules; their laboratory hardness also differs from how easily the compact masses shed grains. A photograph cannot confirm whether blue colour is natural, dyed, or a coating.1 2

Magnesite can be white with grey veins and is also dyed to imitate turquoise. Natural turquoise has a different chemistry, and attractive vein patterns alone cannot separate it from dyed substitutes. Marble or other white carvings can resemble a smooth howlite bead. If a blue piece matters as a turquoise purchase, ask for a clear material name and treatment disclosure rather than attempting a destructive home test.1 2 3

Howlite is a calcium borosilicate. Mindat records it chiefly as compact earthy masses and only rarely as well-formed crystals. It occurs in boron-bearing geological settings, including evaporite-related deposits, where dissolved material supplied its calcium, boron and silica. The dark tracery familiar in carved material reflects other material or fractures within the mass; it is not a separate mineral species called “web howlite.”1

Modern crystal sellers associate white howlite with quieting a busy mind. Energy Muse places it in a contemporary crown-chakra story, using its pale surface as an image of stillness. A small stone on a desk can become a personal cue to pause before a hard conversation. That sentiment belongs to the person who keeps it; the surviving nineteenth-century record for howlite concerns a new mineral from Nova Scotia, not an ancient calming rite.1 4

Identify the material and treatment before comparing prices. GIA lists howlite among materials dyed in the gem trade and warns that solvents such as alcohol or acetone can affect dyes; prolonged sunlight may also fade some colours. Wipe finished pieces gently and keep dyed beads away from perfume and harsh cleaners. The crystals' Mohs hardness is about 6.5, while compact earthy masses can separate far more easily, so do not use a hardness number as a promise that a carving cannot chip. Photos are not proof of turquoise identity or untreated colour.1 2

Often confused with

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