Alumoedtollite is an extremely rare zeolite group mineral discovered in the alkaline massifs of the Kola Peninsula. It typically occurs as small, clear tabular crystals associated with other rare alkaline minerals in pegmatite cavities.

Hardness

2-3

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Alumoedtollite

Hardness: 2-3
Luster: Vitreous
Streak: White
Transparency: Transparent

No image

Is this alumoedtollite?

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 alumoedtollite with a known reference. Alumoedtollite sits at Mohs 2-3 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Alumoedtollite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Alumoedtollite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: white, colorless.
5
Look at form & habit
Crystal system: triclinic. Typical habit: tabular crystals.

Often confused with

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

mineral

Natrolite

Mohs 5-5.5

How to tell apart: Natrolite is the harder of the two (Mohs 5-5.5 vs. 2-3).

How to tell apart: Gonnardite is the harder of the two (Mohs 5 vs. 2-3).

Compare →

Often found alongside alumoedtollite

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

All properties

Chemical formula: Na₂Al₂Si₂O₈·2H₂O
Mohs hardness: 2-3
Density: 2.1-2.2 g/cm³
Colors: White Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Triclinic
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Rocks
Typical price: expensive due to rarity

Where rockhounds find alumoedtollite

Classic worldwide localities

Khibiny Massif, Russia

Field-hunting tip

Look in alkaline igneous rocks country — that is the host setting where alumoedtollite typically forms. If you start seeing microcline, aegirine, nepheline in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify alumoedtollite?+

Mohs hardness is 2-3. It typically shows a vitreous luster. The streak is white. Common colors include white, colorless.

Where is alumoedtollite found?+

Notable localities include Khibiny Massif, Russia.

How much is alumoedtollite worth?+

Typical asking prices fall in the range of expensive due to rarity. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like alumoedtollite?+

Alumoedtollite is most often confused with Natrolite, Gonnardite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with alumoedtollite?+

Alumoedtollite commonly co-occurs with Microcline, Aegirine, Nepheline, Eudialyte. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does alumoedtollite form in?+

Alumoedtollite typically forms in alkaline igneous rocks. Working float back to the host body is the standard way to chase a fresh occurrence.

What is alumoedtollite used for?+

Alumoedtollite is used in collector.

Find alumoedtollite on the map

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