Hoov's postThe idiots are trying to bury this excellent rebuttal...so thought I would repost to keep on everyone's radar:
jaberwock wrote:
Look up this scientific paper which describes the typical properties of 18 of these "unique" graphite deposits:
NATURAL FLUID-DEPOSITED GRAPHITE:
MINERALOGICAL CHARACTERISTICS AND MECHANISMS
OF FORMATION
F. J. LUQUE,* J. D. PASTERIS,** B. WOPENKA,** M. RODAS,*
and J. F. BARRENECHEA *
In the paper you will find that:
"The majority of fluid deposited graphite consists of medium- to coarse-grained flakes or needles and thus resembles high-grade metamorphic graphite"
Also note that:
"Graphite precipitated from fluids is commonly highly anisotropic"
Which disproves an earlier claim that hydrothermal graphite is isotropic.
I not only read that paper months ago, Jaberwock, unlike you, I understood it. Let me help you with that.
The paper is about crystallinity of graphite, but that concept is expressed in a number of different ways. Your first quotation is accurately rendered, but I see it as irrelevant, in the context of the rest of the paper. They're talking about high-grade metamorphism, not high-grade (purity) of metamorphic graphite.
Your second quotation is not accurately rendered, and is thus stripped of both context and meaning.The rest of the sentence reveals the intended meaning.
"Graphite precepitated from fluids is commonly highly anisotropic..., indicative of a high degree of crystallinity."
They're talking about optical anisotropy. Not electrical. Not thermal. That's anisotropy of reflected light. Anisotropy is a descriptor about the uniformity of a property, not a property in itself.
To make that point absolutely clear, one needs only to read the end of the paragraph from which you improperly quoted. "An interesting contrast to this generalization is reported by Mastalerz, Bustin, and Sinclair (1995), who studied hydrothermal gold-quartz veins in which the concentrated carbonaceous material is isotropic or weakly anisotropic, indicative of a low state of crystallinity." That should make clear that the context is reflected light microscopy, in which anisotropy of that measure is correlated with high crystallinity.
In the Discussion, these authors compare fluid-derived (hydrothermal) graphite to metamorphic (flake) graphite. Here are some of their conclusions:
"The structural data obtained by XRD, Raman spectroscopy, and HRTEM indicate that natural graphite precipitated from fluids is fairly homogenous (unlike metamorphic graphite), that is, there are no large fluctuations in the "crystallinity" of a given sample. In addition, the majority of fluid-deposited graphite samples are characterized by very high crystallinity."
"Compared to metamorphic graphite, fluid deposited graphite appears to be dominated by a high degree of crystallinity and marked homogeneity of crystallinity."
Please, jaberwock, whatever it is that you might be expert in, this is not it. Please restrict yourself to commenting on things that you comprehend.
Lar
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