Fluoro-cannilloite is an exceptionally rare member of the amphibole supergroup characterized by its fluorine-dominant site. It typically occurs as prismatic crystals within contact-metamorphosed limestone deposits and requires advanced analytical methods for positive identification.

Hardness

5-6

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralrareAmphibole Supergroup family

Fluoro-cannilloite

Hardness: 5-6
Luster: Vitreous
Streak: White
Transparency: Translucent

No image

Is this fluoro-cannilloite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch fluoro-cannilloite with a known reference. Fluoro-cannilloite sits at Mohs 5-6 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Fluoro-cannilloite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Fluoro-cannilloite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: brown, yellow-brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: prismatic crystals.

Often confused with

Fluoro-cannilloite vs. its common look-alikes — and how to tell them apart in the field.

mineral

Hastingsite

Mohs 5-6

How to tell apart: Streak differs — Fluoro-cannilloite leaves white, Hastingsite leaves white to light gray.

Often found alongside fluoro-cannilloite

Minerals reported to co-occur with fluoro-cannilloite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: CaCa₂(Mg₄Al)(AlSi₇O₂₂)F₂
Mohs hardness: 5-6
Density: 3.31 g/cm³
Colors: Brown Yellow-brown
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Prismatic Crystals
Cleavage: Perfect in Two Directions
Rarity: Rare
Uses: Collector
Host rock: Metamorphic Limestones
Typical price: expensive to rare market collector pricing

Where rockhounds find fluoro-cannilloite

Classic worldwide localities

Pargas, Finland

Field-hunting tip

Look in metamorphic limestones country — that is the host setting where fluoro-cannilloite typically forms. If you start seeing calcite, diopside, phlogopite in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify fluoro-cannilloite?+

Mohs hardness is 5-6. It typically shows a vitreous luster. The streak is white. Common colors include brown, yellow-brown.

Where is fluoro-cannilloite found?+

Notable localities include Pargas, Finland.

How much is fluoro-cannilloite worth?+

Typical asking prices fall in the range of expensive to rare market collector pricing. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like fluoro-cannilloite?+

Fluoro-cannilloite is most often confused with Hastingsite, Edenite, Tremolite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with fluoro-cannilloite?+

Fluoro-cannilloite commonly co-occurs with Calcite, Diopside, Phlogopite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does fluoro-cannilloite form in?+

Fluoro-cannilloite typically forms in metamorphic limestones. Working float back to the host body is the standard way to chase a fresh occurrence.

What is fluoro-cannilloite used for?+

Fluoro-cannilloite is used in collector.

Find fluoro-cannilloite on the map

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