Yamhamelachite

Chemical formula: KCr³⁺P₂O₇

Yamhamelachite is a rare potassium chromium pyrophosphate, forming transparent, green crystals with a vitreous luster.

## Characteristics Yamhamelachite is a very rare mineral from the pyrophosphate group. It occurs as small, tabular or bladed crystals, reaching sizes up to 0.2 mm. It is characterized by a vivid green color and is transparent. Its small size makes it a mineral primarily accessible to specialized collectors and scientific institutions. ## Physical Properties This mineral has a Mohs hardness of approximately 4, classifying it as relatively soft. It has a vitreous luster and a density of 3.035 g/cm³. It is transparent, and its fracture is conchoidal. ## Colors and Varieties Yamhamelachite occurs in a uniform, green color. No color varieties or commercial varieties are known. ## History and Name The mineral's name comes from the Hebrew phrase "Yam ha-Melah," meaning the Dead Sea, near which it was discovered. It was officially recognized by the International Mineralogical Association (IMA) in 2019. Its discovery is associated with the unique geological complex of the Hatrurim Formation in Israel. ## Uses Due to its extreme rarity and microscopic crystal sizes, yamhamelachite has no industrial application. Its significance is purely scientific and collectible (a so-called micromineral).

Properties

Mohs hardness
4-0
Luster
Vitreous
Density
3.035
Fracture
Conchoidal
Transparency
Transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Amateur identification of yamhamelachite is practically impossible due to its microscopic size. It requires advanced analytical techniques such as Raman spectroscopy or EDS analysis. In a collection, it is recognized based on the label and confirmed locality. Its characteristic green color and occurrence in the specific environment of the Hatrurim Formation are distinctive. ## Distinguishing from Similar Minerals It can be confused with other green secondary minerals found in the Hatrurim Formation, such as some phosphates or vanadates. Definitive differentiation is only possible through chemical and crystallographic analysis. ## Crystal Forms It forms very small, tabular or bladed crystals, usually grouped into small aggregates. Crystals rarely exceed 0.2 mm in length.

Geological environment

## Genesis Yamhamelachite is a pyrometamorphic mineral. It forms as a result of reactions occurring at very high temperatures in sedimentary rocks (marls, limestones) of the Hatrurim Formation. Its crystallization is associated with volcanic activity or prolonged, natural combustion of underground bitumen deposits, which transformed the surrounding rocks. ## Mineral Associations This mineral co-occurs with other rare minerals typical of the Hatrurim Formation, such as larnite, brownmillerite, spurrite, as well as hematite, maghemite, apatite, and calcite. ## Localities The only confirmed locality of yamhamelachite in the world is its type locality: Wadi Zohar in the Hatrurim Basin, near the road from Arad to the Dead Sea in Israel.

Rarity

Extremely rare

For collectors

## Quality Criteria As a micromineral, yamhamelachite is primarily evaluated based on the quality and size of its crystals, even though they are very small. The most desirable specimens are those with well-formed, sharp crystals of intense green color, forming rich clusters on a small rock matrix. Contrast with surrounding minerals also enhances the specimen's attractiveness. ## Popular Localities The only source of specimens is the type locality in Israel. Material from this location is extremely difficult to obtain and enters the collector's market in very limited quantities, mainly through specialized dealers or exchange among collectors.

Care and storage

## Cleaning Specimens of this mineral, due to their microscopic size and delicacy, usually do not require cleaning. If absolutely necessary, compressed air (from a safe distance) can be used to remove loose dust particles. Avoid contact with water and any chemicals. ## What to Avoid Avoid contact with water, acids, detergents, and ultrasonics. The mineral is soft (hardness 4), so it is susceptible to scratching. Protect it from high temperatures and sudden temperature changes. ## Storage Yamhamelachite specimens should be stored exclusively in specialized micromount boxes to protect them from mechanical damage, dust, and moisture. Display should be in stable conditions, away from direct sunlight.

External references

Sources

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