Consulting economic geologist
Jeffrey C. Reid, PhD, PG, CPG

Aggregates - services

Aggregate and sand services — Petrographic, ASTM standards, mineralogy, point counting, reporting, advanced instruments, special studies, data mining for green field projects, tailings, 'bad ground' studies

Petrographic study using ASTM standard C295/C295M-12. Crushed stone and sands of all types are included.

Meets ASTM standard for qualification of petrographers.

Use a transmitted and reflected light petrographic microscope and stereozoom binocular microscope. Fully equipped facility.

Identify the rock type. Point count thin sections. Describe and document mineralogy, alteration / weathering, presence or absence of unstable minerals (soluble sulfates, or unstable sulfide minerals), volumetrically unstable minerals (such as smectites), grain shape (concerns for flat or elongated mineral grains), potential alkali-silica and alkali-carbonate reactive constituents, and presence / absence of contaminants in aggregates (e.g., synthetic glass, cinders, clinkers or coal ash).

Reports are profusely illustrated in color. Clients are encouraged to review report results in draft form to ensure the report's clarity and meets the client's specifications. After review comments are addressed and the report is finalized, only then is the client invoiced. Reports are in digital formation (PDF) and all residual materials, thin sections, plus scanned lab notes, and other data are returned to the client in digital format.

Access to x-ray diffraction (XRD), scanning electron microscopes (SEM) and other advanced analytical instruments.

By arrangement, "data mining" including comprehensive database searches for "green field projects", core logging, and site studies including investigations of cause of "bad ground" and reduced rock quality.

Tailings studies (mineralogy, size fractions, and chemistry).

Contact us about special problems not listed; we may be able help. Email Dr. Reid, voice: 919.618.0810.

aggregate pit piedmont

Above: Piedmont aggregate quarry.

aggregate slab stained for feldspar

Above: Chemical staining facilitates the type and amount of potassium- (yellow stain), a plagioclase (pink stain) feldspar. Quartz (gray) does not stain chemically.

aggregate thin section plane light

Above: Petrographic thin section of a granitic rock viewed in plane polarized light showing stained feldspars and unstained quartz. Field of view is about 2.9 mm; magnification is 40x. Muscovite mica is an accessory mineral.

aggregate thin section cross polarized light

Above: Petrographic thin section of a granitic rock viewed in plane cross-polarized light showing stained feldspars and unstained quartz. Field of view is about 2.9 mm; magnification is 40x. Muscovite mica is an accessory mineral. Same field of view as previous image.