Ferro-actinolite (original) (raw)

RI values:

_n_α = 1.668 _n_β = 1.685 _n_γ = 1.702

2V:

Measured: 10° to 12°, Calculated: 88°

δ = 0.034

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

r > v or r < v

Optical Extinction:

Y = b; Z ∧ c = 12.5°-17°.

Comments:

Moderate to strong, in yellows and greens.

Comments:

Absorption: Z > Y >= X.

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 9.91 Å, b = 18.17 Å, c = 5.27 Å
β = 104.98°

Ratio:

a:b:c = 0.545 : 1 : 0.29

Unit Cell V:

916.69 ų (Calculated from Unit Cell)

Twinning:

Simple or lamellar twinning parallel to {100}.

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CIF Raw Data - click here to close

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.