• 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.)

    Ready to learn how to identify gems on your own?

    Join our mailing list below to download a FREE gem ID checklist tutorial. See what’s inside…

    • Discover the 17 practical steps to gemstone identification (even if you’re just getting started with gemology)

    • Learn how you can use specific tools to gather data, make observations & arrive at an accurate ID

    • Explore a range of gemological tests… not only will you get familiar with the process but also time-saving shortcuts!

    国产白浆高潮正在播放