How do you care for sapphirine?

It rates 7.5 on the Mohs scale. Clean it with warm water and a soft cloth, and keep it out of ultrasonic tanks and steamers.

Home / The Crystal Guide / Sapphirine

A stone guide

Sapphirine

Q: What is often mistaken for sapphirine?

Sapphire (corundum). Corundum is harder (9) and heavier (SG 4.0); sapphirine sits at 7.5 and SG 3.45.

Sapphire-blue granular mineral from extreme high-grade metamorphic rocks; harder than quartz.

Silicates (Mg-Al silicate)MadagascarSee treatment disclosure

Sapphirine is silicates (Mg-Al silicate), (Mg,Al)8(Al,Si)6O20. In the hand, it rates 7.5 on the Mohs scale, and it runs sapphire blue and blue-green. Sapphire-blue granular mineral from extreme high-grade metamorphic rocks; harder than quartz, it looks like sapphire's shy cousin in gneiss. Granulite-facies rocks: Fiskenaesset (Greenland, classic), Madagascar, Sri Lanka (gem gravels), Antarctica.

Family

Silicates (Mg-Al silicate)

Mohs

7.5

System

Monoclinic

Luster

Vitreous

Gravity

3.4 to 3.5

Light

Transparent to translucent

What it is

The geology.

Sapphirine carries the formula (Mg,Al)8(Al,Si)6O20. It belongs to the monoclinic system. Catalogues list it as silicates (Mg-Al silicate).

It sits at 7.5 on the Mohs scale. The surface reads vitreous. Light behaviour is transparent to translucent. Specific gravity runs 3.4 to 3.5. The streak is white. It breaks with indistinct cleavage; uneven fracture.

Sapphire-blue granular mineral from extreme high-grade metamorphic rocks; harder than quartz, it looks like sapphire's shy cousin in gneiss.

It reaches buyers as granular masses in metamorphic rock, rare tabular crystals or faceted collector gems.

Where it comes from

The origins.

Granulite-facies rocks: Fiskenaesset (Greenland, classic), Madagascar, Sri Lanka (gem gravels), Antarctica.

On value, the database notes: collector rarity; faceted Sri Lankan stones are specialist items.

What people work with it for

Traditional associations.

In energy work traditions, associated with calm insight and speaking wisdom simply.

We keep this section because people ask. It sits below the geology on purpose, and none of it describes something the stone does.

What to look for

Spotting the real thing.

Sapphire-blue granular mineral from extreme high-grade metamorphic rocks; harder than quartz, it looks like sapphire's shy cousin in gneiss.

The similar name invites sapphire-substitute scams; sapphirine is its own species and gem-grade is genuinely rare.

Looks like	How to tell them apart
Sapphire (corundum)	Corundum is harder (9) and heavier (SG 4.0); sapphirine sits at 7.5 and SG 3.45
Kyanite	Kyanite is bladed with dual hardness and pearly cleavage
Lazulite	Lazulite is softer (5.5 to 6) with azure tones in quartz veins

Check it yourself

At-home tests.

Before anyone talks you into a lab report, these are the checks worth doing yourself on sapphirine.

Test	What you should see
Scratch check	Scratches quartz (7.5)
By eye	Granular habit in gneissic matrix
By eye	Blue color paler and grayer than gem sapphire

Anything that scratches, burns or dissolves the piece is a lab job. Get it appraised rather than testing it apart.

How to live with it

Care & handling.

At 7.5 on the Mohs scale it stands up to everyday wear. It will still chip on a hard knock, so treat edges and points with respect.

It breaks with indistinct cleavage; uneven fracture, which is worth knowing before you set it or drop it.

Warm water and a soft cloth clean almost everything. Ultrasonic tanks, steamers and household cleaners are where pieces get ruined.

Pairs well with.

For the serious reader

A deeper look.

Extended detail on composition, sourcing, authentication and market value.

The physical record

The formula on record is (Mg,Al)8(Al,Si)6O20. Crystal system: Monoclinic. Specific gravity: 3.4 to 3.5. Streak: White. Cleavage and fracture: Indistinct cleavage; uneven fracture.

How it reaches the market

Granulite-facies rocks: Fiskenaesset (Greenland, classic), Madagascar, Sri Lanka (gem gravels), Antarctica.

What it gets confused with

Sapphire (corundum): Corundum is harder (9) and heavier (SG 4.0); sapphirine sits at 7.5 and SG 3.45. Kyanite: Kyanite is bladed with dual hardness and pearly cleavage. Lazulite: Lazulite is softer (5.5 to 6) with azure tones in quartz veins.

What it is worth

Collector rarity; faceted Sri Lankan stones are specialist items.

Where buyers get caught

The similar name invites sapphire-substitute scams; sapphirine is its own species and gem-grade is genuinely rare.

One more thing

Sapphirine forms only under crustal conditions so hot they border on melting, petrologists treat it as a thermometer reading 'extreme'.

From the Beyond Bohemian library

An education-first guide.

No product links here. We do not sell sapphirine, and a guide that only covers our own shelves would not be much of a guide.

Explore the Crystal Guide

← Prev