The old dump and tailings piles
This is the single highest-yield ground in the Northeast, and the reason is historical rather than geological. The commercial pegmatite mines of the late 1800s and early 1900s worked for sheet mica, feldspar for ceramics, and beryl for beryllium. Anything that was not one of those three was WASTE, and it went on the dump. That means the dumps were built out of exactly the material a specimen collector wants: quartz crystals, gem tourmaline, beryl in crystal form, garnet, apatite, columbite, and the uranium minerals nobody wanted to handle.
What we do: Work the loose material at the base and edges of a dump first, where weathering has freed crystals from matrix. Look for fresh colour in broken rock — a dull grey dump face hiding a pocket of gemmy material is the classic find.
Kit Hand lens, small pry bar, screen for washing fines
Pocket (vug) zones in the core margin
Gem-bearing pockets in a pegmatite sit in the core margin zone — the boundary running between the quartz core and the blocky feldspar. That is where the late-stage fluids concentrated the elements that make beryl, tourmaline and apatite. Knowing which zone you are standing in tells you whether to keep digging or move.
What we do: Read the wall: coarse blocky feldspar with book mica is the intermediate zone; approaching glassy grey quartz means you are near the core. The contact between them is the target.
Kit Hand lens, hardness kit, patience
Pegmatite against wall rock
Where a pegmatite meets the surrounding schist or gneiss, the chemistry changes abruptly and unusual species form — phosphates, rare oxides, and the uranium minerals. a classic locality and a well-known historic pegmatite are both famous for exactly this kind of contact mineralogy.
What we do: Walk the contact line and look for colour changes, staining, and crusts that do not match the bulk rock. Secondary uranium minerals show as bright yellow-green coatings.
Kit UV lamp, Geiger counter, gloves
Books of mica
Mica was the commercial prize, so big books were taken and the smaller ones left. Books are also the most fragile thing we handle — they cleave into sheets under almost no load, which is why mica ships in a rigid immobilised box and never a padded envelope.
What we do: Photograph books in place before moving them. Note the book size and whether the sheets are clear, stained, or intergrown with something else.
Kit Camera first, then both hands
Quartz — massive, smoky, and crystal
The most common thing in these dumps and the backbone of what we catalogue. Smoky quartz is the signature of the northeast pegmatites. It is heavy, which is why 'heavy' appears as a shipping fact and not a complaint: dense rock is what flat-rate postage is cheapest for.
What we do: Weigh everything. A quartz piece is catalogued by real grams, and a pool of many small pieces is never minted or shipped as one certificate.
Kit Scale
UV-fluorescent material
A large share of what we pull fluoresces green under shortwave UV. Fluorescence is the honest, measurable property we catalogue — it is a real observation with a recorded response, unlike a species name, which needs lab work to be more than a guess.
What we do: Record WHICH wavelength produced the response — shortwave (254 nm) and longwave (365 nm) do not behave the same, and a reading without the wavelength is not a reading.
Kit Shortwave and longwave UV lamp, dark bag