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          Actinolite Value, Price, and Jewelry Information

          Actinolite

          Actinolite

          Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is the Mg end, and ferroactinolite the Fe end, with actinolite in the middle. Actinolites with more than 50% Fe are very rare.?Catseye?actinolite exists (S.G. 3.0, R.I. 1.63); when chatoyant material is cut, it exhibits a fine eye. Actinolite is easy to cleave and hard to cut and would make a poor jewelry stone. Actinolite is the chief constituent of nephrite (jade).?Smaragdite?is a chrome-rich tremolite from Tanzania.

          Actinolite Value

          The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

          Actinolite Value via Gem Price Guide

          Accompanying value information:
          Not found
          Cut Weight Price
          Cat’s Eye 1 carat /ct

          Actinolite Information

          Data Value
          Name Actinolite
          Varieties Smaragdite
          Colors Pale to dark green, blackish green, black.
          Hardness 5.5
          Fracture Uneven, Often fibrous nature
          Cleavage 2 directions good
          Stone Sizes Actinolite is rarely facetable and usually in small fragments. Material from Chester, Vermont, could provide stones to about 10 carats. DG: 2.06 (greenish, step cut, Africa)
          Formula Ca2(Mg, Fe)5Si8O22(OH)2
          Crystallography Monoclinic; bladed crystals, usually elongated; fibrous, columnar aggregates. Also massive, granular, Often twinned.
          Refractive Index 1.619-1.644
          Birefringence 0.022-0.026.
          Dispersion 0.009
          Luminescence None (due to presence of Fe).
          Absorption Spectrum Faint line at 5030.
          Pleochroism

          Yellow to dark green. Material transparent to nearly opaque. α: pale yellow/ yellowish-green. β: pale yellow-green/green. γ: pale green/ deep greenish blue.

          Optics α?=?1.619-1.622;?β = 1.632-1.634;?γ = 1.642-1.644 (Tanzanian material).?Biaxial (-); 2V =?78°. See chart for series member optics.
          Optic Sign Biaxial -
          Luminescence Present No
          Luster Vitreous, sometimes dull.
          Specific Gravity Usually 3.05; Tanzania: 3.03-3.07; Max.: 3.44.
          Transparency Translucent to transparent.
          Phenomena Chatoyancy.

          Comments:?Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is the Mg end, and ferroactinolite the Fe end, with actinolite in the middle. Actinolites with more than 50% Fe are very rare.?Catseye?actinolite exists (S.G. 3.0, R.I. 1.63); when chatoyant material is cut, it exhibits a fine eye. Actinolite is easy to cleave and hard to cut and would make a poor jewelry stone. Actinolite is the chief constituent of nephrite (jade).?Smaragdite?is a chrome-rich tremolite from Tanzania.

          Name:?Greek?aktis,?meaning?ray,?due to the fibrous nature.

          Optics:

          α?=?1.619-1.622;

          β = 1.632-1.634;

          γ = 1.642-1.644 (Tanzanian material).

          Biaxial (-); 2V =?78°

          Occurrence: Contact metamorphic limestones and dolomites; magnesium-rich limestones and ultrabasic rocks; regionally metamorphosed rocks.

          Locality Pleochroic Colors α β γ Birefringence S.G. Comments
          Fowler, New York red-violet 1.602 1.630 0.028 3.03 Hexagonite
          Kenya bright green 1.602 1.613 1.628 0.026 2.99 Tremolite
          1.607 1.618 1.632 0.025 3.01
          Tanzania (Lelatema) yellow green/green 1.608 1.616 1.631 0.023 3.01 Tremolite
          Tanzania emerald green 1.611 1.623 1.639 0.028 3.30 Tremolite + Cr
          Tanzania (Merelani) yellow-green/emerald green 1.608 1.618 1.63 0.022 Smaragdite
          Taiwan yellow-green/green tones, 1.607- 1.630- 0.023- 3.01 Tremolite
          also brownish 1.609 1.633 0.024
          1.615- 1.631- 0.014- 3.01 Catseye tremolite
          1.619 1.633 0.016
          Uganda yellow-green/green 1.619- 1.632- 1.642- 0.021- 3.04- Tremolite-Actinolite
          1.622 1.634 1.644 0.024 3.07
          green/brown 1.633 1.653 0.020 3.15 Actinolite
          Chemical composition vs. optics and density of common hornblendes. Adapted from W.A. Deere, R.A. Howie, and J. Zussman, 1962, The Rock Forming Minerals, vol.2 (New York: Wiley), p.296.

          Chemical composition vs. optics and density of common hornblendes.
          Adapted from W.A. Deere, R.A. Howie, and J. Zussman, 1962, The Rock Forming Minerals, vol.2 (New York: Wiley), p.296.

          Chester, Vermont.

          Madagascar:?small, dark green crystals. Many of these are clean and suitable for faceting.

          Tanzania:?transparent crystals. (See also nephrite.)

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