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This piece weighs 50g and measures 5cm x 4cm x 2cm.

This particular group of specimen pieces are Pink Natrolite with Analcime in Basalt and are from the district in Tasmania Australia. The Blue Tier district consists of a range of hills, mountains and alpine plateaus situated approximately 35kms east of Scottsdale, and 25kms North West of St Helens.

Natrolite:-

Named for the Greek for “sodium,” natrio, in reference to the mineral’s sodium content, and for “stone,” lithos. Natrolite is a mineral that occurs in cavities in basalts and other igneous rocks as one of the last minerals to forms, and also occurs as a filling in seams in granites, gneisses, and syenites.

Natrolite is pyroelectric and piezoelectric, and will generate a charge in response to temperature and pressure changes, respectively. It will commonly fluoresce an orange to yellow under ultraviolet light.

Natrolite is the principal member of a group of zeolite minerals whose molecular structure is predominantly chains of linked silicate and aluminate tetrahedra (four oxygen atoms arranged at the points of a triangular pyramid about a central silicon or aluminium atom); the relative scarcity of lateral bonds between chains results in the characteristic fibrous appearance of the group. Other zeolites in the natrolite group are Mesolite, Scolecite, Thomsonite and Gonnardite; all have similar modes of occurrence, molecular structures, and physical properties, even though they have different crystal symmetries: mesolite and scolecite crystallize in the monoclinic system (three unequal axes with one inclined to the plane of the other two), whereas Natrolite, Thomsonite, and Gonnardite crystallize in the orthorhombic system (three unequal axes at right angles to one another). Mesolite is chemically intermediate between Natrolite and Scolecite.

Natrolite was one of the first zeolite minerals for which cation-exchange properties (dissolved sodium, potassium, calcium, and magnesium readily replacing one another in the molecular structure) were discovered. It is used in softening water.

Analcime:

The name Analcime is derived from the Greek term "an alkimos", meaning "not strong, in allusion to the weak pyroelectricity exhibited by this mineral.

Analcime or analcite is a white, grey, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi₂O₆·H₂O. Minor amounts of potassium and calcium substitute for sodium.

Analcime is a member of the Zeolite group and often occurs together with other zeolites. However, it is closely related in structure to the Feldspathoid group and is occasionally also classified as a Feldspathoid together with the similar mineral Leucite. However, most mineralogical sources, including the IMA, classify Analcime only as a Zeolite and not as a feldspathoid.

Although the crystal structure of Analcime appears isometric its is usually off by only a fraction of an angle. This technically removes its classification from the isometric crystal system. Analyses of different Analcime crystals have yielded multiple results in crystal symmetry, with the most prevalent symmetry being tetragonal. However, truly isometric examples have been analysed and do exist, thus making this mineral complex in its crystal classification. Due to Analcime's appearance as an isometric mineral, and the fact that isometric examples do exist, we have placed this mineral within the isometric group for classification.