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1965年在苏联发现。物理性质呈粉末状或放射状集合体。由于晶体太小(仅0.n—0.0n mm)晶形辨别不出,只有在高倍显微镜下才能看出针状晶体,其尖端呈正方形或非对称的尖形,清楚的晶形只有在电子显微镜下可见(图25)。比较大的晶粒中勉强见到解理平行晶体延长方向。颜色为褐色到红褐色。微透明。在双目镜下可见红色的内反射。硬度3.3(约105kg/mm~2)。比重4.2。光学性质在透射光下颜色为红褐色到黑色不透明。二轴晶。由于矿物微透明光性测定比较困难。多色性弱:Ng——红褐色,Nm和Np——黑红褐色。折光率>1.789。正延长。消光角(Ng∧晶体延长方向)为38°在反射光下呈带褐色色调的灰色。反射率为11.8％。非均质性很弱,为其强红色的内反射所掩盖。
Found in 1965 in the Soviet Union. Physical properties were powdered or radial assembly. As the crystal is too small (only 0.n-0.0n mm) crystal form can not tell, only under high magnification microscope can be seen acicular crystals, the tip is square or asymmetric spikes, clear crystal form only under the electron microscope Visible (Figure 25). Larger grains barely see the extension of cleavage parallel crystals. The color is brown to reddish brown. Micro-transparent. Visible in the binocular red internal reflex. Hardness 3.3 (about 105kg / mm ~ 2). The proportion of 4.2. Optical properties Under transmitted light the color is reddish brown to black opaque. Biaxial crystal. As the mineral micro-transparent photometry more difficult. Coloring weak: Ng - reddish brown, Nm and Np - black and reddish brown. Refractive index> 1.789. It is prolongation. Extinction angle (Ng ∧ crystal extension direction) of 38 ° in the reflected light was brown with a gray tone. Reflectivity was 11.8%. Heterogeneity is weak and masked by its strong red internal reflections.