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Brimstone Mtn Mine, D Township, Franklin Co., Maine, USAi
Regional Level Types
Brimstone Mtn Mine- not defined -
D TownshipTownship
Franklin Co.Township

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Latitude & Longitude (WGS84): 44° 47' 30'' North , 70° 41' 34'' West
Latitude & Longitude (decimal): 44.79194,-70.69278
GeoHash:G#: drvwz655f
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
Byron126 (2017)9.2km
Roxbury399 (2017)15.7km
Andover898 (2017)18.0km
Rangeley128 (2017)19.8km
Madrid180 (2017)19.9km

Brimstone Mtn Mine, which works a pegmatite, is located near the western end of Brimstone Mtn, roughly 1 mile (1.8 kilometers) east of Ten Degree, which is a 10 degree bend around the extreme western edge of Brimstone on the Bemis Track. The mine is roughly 2 miles (3 kilometers) south of the Bemis prospect.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: Be3Al2(Si6O18)
Habit: mostly tapered with a small amount of classic hexagonal crystals.
Colour: white, colorless, bluish aqua, greenish aqua, yellow
Description: The beryl crystals are very unusual in several ways. They are amorphous for the most part with gem quality or highly colored amorphous veins (blue or colorless) swirled through certain portions like marble or in an uneven parallel orientation, but rather too thin for gem faceting. Most all the crystals are strongly tapered (cone shaped) and intergrown with feldspar which is a rather rare growth habit. The feldspar intergrowths are thin (quarter inch [5 mm] or less) and often crosscut the entire crystal on the horizontal axes near the pointed tapered end. The thicker portions of the tapered crystals have intergrowths in the core only so nothing is visible on the exterior. This growth pattern (on surface weathered specimens) visually resembles a pinecone. Many of the beryl crystals also exhibit an exterior intergrowth where the beryl and feldspar grow into each other which gives the beryls the appearance of being etched. Intergrowths with k-feldspar have a different look than intergrowths with Na-feldspar. K-spar gives the beryls an etched look with some rounded cavities that look like small drill holes when the feldspar weathers out and the Na-spar leaves the beryls looking like they have been hacked by a miniature axe with platey white albite (cleavelandite) crystals scattered throughout in random directions. These effects are most striking on surface weathered beryl crystals. The larger beryls (3 feet [1 meter] or larger) almost always exhibit multiple colors in various portions of the crystal. The finely tapered ends are mostly yellow-to-green grading into greenish blue or bluish aqua that is commonly swirled with white, with the butt ends of the crystals commonly having an outer rind of golden yellow. These golden areas are ALWAYS found with many columbites intergrown with it to such an extent that these yellow/gold portions are too contaminated for jewelry purposes but excellent for mineral collecting. It is not unusual to find columbite crystals embedded (intergrown) in other colored portions of the beryls or sandwiched in between 2 beryl crystals. The beryls can be of immense size with the largest discovered yet being 6.5 feet (2 meters) long. It occurs in tonnage. The tapered (pointed) ends of the beryls almost always terminate in classic hexagonal crystal form for about 2 to 3 inches (5 to 7.5 centimeters) and are of superior color with high potential for gem quality. Around 80% of all beryls are perpendicular (or nearly so) to the contact with some laying nearly parallel to it. Some crystals taper to a very fine needle point while others end abruptly just like how a carrot looks when the small end is cut off. They all end/terminate within 2 inches (5 centimeters) of the pegmatite contact with the granite. The vast majority of the largest crystals are found in solid milk quartz but a few have their largest (butt) ends terminating in feldspar.
Reference: This mineral identified by Maine Mineral and Gem Museum, Bethel, Maine, USA and by local dealers.
Reference: Todd Voters Collection
Formula: SiO2
Reference: Todd Voters Collection
Quartz var: Rose Quartz
Formula: SiO2
Reference: Todd Voters Collection
Formula: LiAlSi2O6
Reference: Todd Voters Collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Rose Quartz4.DA.05SiO2
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.
var: Rose Quartz

List of minerals for each chemical element

Li SpodumeneLiAlSi2O6
Be BerylBe3Al2(Si6O18)
O BerylBe3Al2(Si6O18)
O SpodumeneLiAlSi2O6
O Quartz (var: Rose Quartz)SiO2
O QuartzSiO2
Al BerylBe3Al2(Si6O18)
Al SpodumeneLiAlSi2O6
Si BerylBe3Al2(Si6O18)
Si SpodumeneLiAlSi2O6
Si Quartz (var: Rose Quartz)SiO2
Si QuartzSiO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Devonian - Silurian
358.9 - 443.8 Ma

ID: 3185741
Paleozoic intrusive rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

419.2 - 443.8 Ma

ID: 2956934
Silurian Greenvale Cove Formation

Age: Silurian (419.2 - 443.8 Ma)

Stratigraphic Name: Greenvale Cove Formation

Description: GS - Greenschist facies; Protolith V - Basaltic volcanic rocks

Comments: Original map source: Digital bedrock data downloaded from Maine Office of GIS in September 2005; permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006. Based on 1985 paper geologic map (Reference ME002).

Lithology: Major:{metasandstone,slate,calc silicate rock}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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